diff --git a/DbSketch.pro b/DbSketch.pro
new file mode 100644
index 0000000..c0cf9fa
--- /dev/null
+++ b/DbSketch.pro
@@ -0,0 +1,6 @@
+TEMPLATE = subdirs
+
+SUBDIRS += sketchlib \
+           sketchviewer
+
+sketchviewer.depends += sketchlib
diff --git a/sketchlib/basecontainer.cpp b/sketchlib/basecontainer.cpp
new file mode 100644
index 0000000..06807cc
--- /dev/null
+++ b/sketchlib/basecontainer.cpp
@@ -0,0 +1,59 @@
+#include "basecontainer.h"
+
+#include <QDebug>
+#include <QJsonObject>
+
+const QHash<QJsonValue::Type, QString> BaseContainer::m_types {
+    { QJsonValue::Null, QStringLiteral("Null") },
+    { QJsonValue::Bool, QStringLiteral("Bool") },
+    { QJsonValue::Double, QStringLiteral("Double") },
+    { QJsonValue::String, QStringLiteral("String") },
+    { QJsonValue::Array, QStringLiteral("Array") },
+    { QJsonValue::Object, QStringLiteral("Object") },
+    { QJsonValue::Undefined, QStringLiteral("Undefined") }
+};
+
+QMap<QString, int> BaseContainer::m_missing;
+
+BaseContainer::BaseContainer(QObject *parent) :
+    QObject(parent)
+{
+}
+
+const QString &BaseContainer::do_objectID() const
+{
+    return m_do_objectID;
+}
+
+void BaseContainer::parseFromJson(const QJsonObject &jsonObj)
+{
+    for(auto iter = jsonObj.constBegin(); iter != jsonObj.constEnd(); iter++)
+    {
+        if(iter.key() == QStringLiteral("_class"))
+            continue;
+
+        if(!parseProperty(iter.key(), iter.value()))
+        {
+            m_missing[QStringLiteral("%0::%1").arg(metaObject()->className(), iter.key())]++;
+
+            //qWarning() << "unknown property" << metaObject()->className() << iter.key() << m_types.value(iter.value().type());
+        }
+    }
+}
+
+const QMap<QString, int> &BaseContainer::missing()
+{
+    return m_missing;
+}
+
+bool BaseContainer::parseProperty(const QString &key, const QJsonValue &value)
+{
+    if(key == QStringLiteral("do_objectID"))
+    {
+        Q_ASSERT(value.isString());
+        m_do_objectID = value.toString();
+        return true;
+    }
+
+    return false;
+}
diff --git a/sketchlib/basecontainer.h b/sketchlib/basecontainer.h
new file mode 100644
index 0000000..6b182e4
--- /dev/null
+++ b/sketchlib/basecontainer.h
@@ -0,0 +1,36 @@
+#pragma once
+
+#include <QObject>
+#include "sketchlib_global.h"
+
+#include <QHash>
+#include <QMap>
+#include <QJsonValue>
+
+class QJsonObject;
+class QJsonValue;
+
+class SKETCHLIB_EXPORT BaseContainer : public QObject
+{
+    Q_OBJECT
+    Q_PROPERTY(QString do_objectID READ do_objectID CONSTANT)
+
+protected:
+    explicit BaseContainer(QObject *parent = nullptr);
+
+public:
+    const QString &do_objectID() const;
+
+    void parseFromJson(const QJsonObject &jsonObj);
+
+    static const QMap<QString, int> &missing();
+
+protected:
+    virtual bool parseProperty(const QString &key, const QJsonValue &value);
+
+private:
+    static const QHash<QJsonValue::Type, QString> m_types;
+    static QMap<QString, int> m_missing;
+
+    QString m_do_objectID;
+};
diff --git a/sketchlib/container/artboard.cpp b/sketchlib/container/artboard.cpp
new file mode 100644
index 0000000..3ffeca8
--- /dev/null
+++ b/sketchlib/container/artboard.cpp
@@ -0,0 +1,44 @@
+#include "artboard.h"
+
+#include <QJsonValue>
+#include <QJsonObject>
+
+#include "containerfactory.h"
+
+#include "color.h"
+
+Artboard::Artboard(QObject *parent) :
+    Group(parent),
+    m_backgroundColor(Q_NULLPTR),
+    m_hasBackgroundColor(false)
+{
+}
+
+Color *Artboard::backgroundColor() const
+{
+    return m_backgroundColor;
+}
+
+bool Artboard::hasBackgroundColor() const
+{
+    return m_hasBackgroundColor;
+}
+
+bool Artboard::parseProperty(const QString &key, const QJsonValue &value)
+{
+    if(key == QStringLiteral("backgroundColor"))
+    {
+        Q_ASSERT(value.isObject());
+        m_backgroundColor = ContainerFactory::createContainer<Color>(value.toObject());
+        return true;
+    }
+
+    if(key == QStringLiteral("hasBackgroundColor"))
+    {
+        Q_ASSERT(value.isBool());
+        m_hasBackgroundColor = value.toBool();
+        return true;
+    }
+
+    return Group::parseProperty(key, value);
+}
diff --git a/sketchlib/container/artboard.h b/sketchlib/container/artboard.h
new file mode 100644
index 0000000..0472704
--- /dev/null
+++ b/sketchlib/container/artboard.h
@@ -0,0 +1,25 @@
+#pragma once
+
+#include "group.h"
+#include "sketchlib_global.h"
+
+class Color;
+
+class SKETCHLIB_EXPORT Artboard : public Group
+{
+    Q_OBJECT
+
+public:
+    Q_INVOKABLE explicit Artboard(QObject *parent = Q_NULLPTR);
+
+    Color *backgroundColor() const;
+    bool hasBackgroundColor() const;
+
+protected:
+    // BaseContainer interface
+    virtual bool parseProperty(const QString &key, const QJsonValue &value) Q_DECL_OVERRIDE;
+
+private:
+    Color *m_backgroundColor;
+    bool m_hasBackgroundColor;
+};
diff --git a/sketchlib/container/assetcollection.cpp b/sketchlib/container/assetcollection.cpp
new file mode 100644
index 0000000..dc15905
--- /dev/null
+++ b/sketchlib/container/assetcollection.cpp
@@ -0,0 +1,72 @@
+#include "assetcollection.h"
+
+#include <QDebug>
+#include <QJsonValue>
+#include <QJsonObject>
+#include <QJsonArray>
+
+#include "containerfactory.h"
+
+#include "color.h"
+#include "imagecollection.h"
+
+AssetCollection::AssetCollection(QObject *parent) :
+    BaseContainer(parent),
+    m_imageCollection(Q_NULLPTR)
+{
+}
+
+const QList<Color *> &AssetCollection::colors() const
+{
+    return m_colors;
+}
+
+ImageCollection *AssetCollection::imageCollection() const
+{
+    return m_imageCollection;
+}
+
+bool AssetCollection::parseProperty(const QString &key, const QJsonValue &value)
+{
+    if(key == QStringLiteral("colors"))
+    {
+        Q_ASSERT(value.isArray());
+        for(auto colorValue : value.toArray())
+        {
+            Q_ASSERT(colorValue.isObject());
+            m_colors.append(ContainerFactory::createContainer<Color>(colorValue.toObject(), this));
+        }
+        return true;
+    }
+
+    if(key == QStringLiteral("gradients"))
+    {
+        Q_ASSERT(value.isArray());
+        for(auto gradientValue : value.toArray())
+        {
+            //TODO
+            //qWarning() << "gradients not implemented";
+        }
+        return true;
+    }
+
+    if(key == QStringLiteral("imageCollection"))
+    {
+        Q_ASSERT(value.isObject());
+        m_imageCollection = ContainerFactory::createContainer<ImageCollection>(value.toObject(), this);
+        return true;
+    }
+
+    if(key == QStringLiteral("images"))
+    {
+        Q_ASSERT(value.isArray());
+        for(auto imageValue : value.toArray())
+        {
+            //TODO
+            //qWarning() << "images not implemented";
+        }
+        return true;
+    }
+
+    return BaseContainer::parseProperty(key, value);
+}
diff --git a/sketchlib/container/assetcollection.h b/sketchlib/container/assetcollection.h
new file mode 100644
index 0000000..659b3ea
--- /dev/null
+++ b/sketchlib/container/assetcollection.h
@@ -0,0 +1,32 @@
+#pragma once
+
+#include "basecontainer.h"
+#include "sketchlib_global.h"
+
+class QJsonObject;
+
+class Color;
+class ImageCollection;
+
+class SKETCHLIB_EXPORT AssetCollection : public BaseContainer
+{
+    Q_OBJECT
+    Q_PROPERTY(QList<Color*> colors READ colors CONSTANT)
+    Q_PROPERTY(ImageCollection* imageCollection READ imageCollection CONSTANT)
+
+public:
+    Q_INVOKABLE explicit AssetCollection(QObject *parent = Q_NULLPTR);
+
+    const QList<Color*> &colors() const;
+    ImageCollection *imageCollection() const;
+
+protected:
+    // BaseContainer interface
+    virtual bool parseProperty(const QString &key, const QJsonValue &value) Q_DECL_OVERRIDE;
+
+private:
+    QList<Color*> m_colors;
+    //TODO gradients
+    ImageCollection *m_imageCollection;
+    //TODO images
+};
diff --git a/sketchlib/container/bitmap.cpp b/sketchlib/container/bitmap.cpp
new file mode 100644
index 0000000..30a3397
--- /dev/null
+++ b/sketchlib/container/bitmap.cpp
@@ -0,0 +1,31 @@
+#include "bitmap.h"
+
+#include <QJsonValue>
+#include <QJsonObject>
+
+#include "containerfactory.h"
+
+#include "msjsonfilereference.h"
+
+Bitmap::Bitmap(QObject *parent) :
+    Layer(parent),
+    m_image(Q_NULLPTR)
+{
+}
+
+MSJSONFileReference *Bitmap::image() const
+{
+    return m_image;
+}
+
+bool Bitmap::parseProperty(const QString &key, const QJsonValue &value)
+{
+    if(key == QStringLiteral("image"))
+    {
+        Q_ASSERT(value.isObject());
+        m_image = ContainerFactory::createContainer<MSJSONFileReference>(value.toObject());
+        return true;
+    }
+
+    return Layer::parseProperty(key, value);
+}
diff --git a/sketchlib/container/bitmap.h b/sketchlib/container/bitmap.h
new file mode 100644
index 0000000..aa09b0b
--- /dev/null
+++ b/sketchlib/container/bitmap.h
@@ -0,0 +1,23 @@
+#pragma once
+
+#include "layer.h"
+#include "sketchlib_global.h"
+
+class MSJSONFileReference;
+
+class SKETCHLIB_EXPORT Bitmap : public Layer
+{
+    Q_OBJECT
+
+public:
+    Q_INVOKABLE explicit Bitmap(QObject *parent = Q_NULLPTR);
+
+    MSJSONFileReference *image() const;
+
+protected:
+    // BaseContainer interface
+    virtual bool parseProperty(const QString &key, const QJsonValue &value) Q_DECL_OVERRIDE;
+
+private:
+    MSJSONFileReference *m_image;
+};
diff --git a/sketchlib/container/blur.cpp b/sketchlib/container/blur.cpp
new file mode 100644
index 0000000..e33b659
--- /dev/null
+++ b/sketchlib/container/blur.cpp
@@ -0,0 +1,73 @@
+#include "blur.h"
+
+#include <QJsonValue>
+
+Blur::Blur(QObject *parent) :
+    BaseContainer(parent)
+{
+}
+
+bool Blur::isEnabled() const
+{
+    return m_isEnabled;
+}
+
+const QString &Blur::center() const
+{
+    return m_center;
+}
+
+double Blur::motionAngle() const
+{
+    return m_motionAngle;
+}
+
+double Blur::radius() const
+{
+    return m_radius;
+}
+
+double Blur::type() const
+{
+    return m_type;
+}
+
+bool Blur::parseProperty(const QString &key, const QJsonValue &value)
+{
+    if(key == QStringLiteral("isEnabled"))
+    {
+        Q_ASSERT(value.isBool());
+        m_isEnabled = value.toBool();
+        return true;
+    }
+
+    if(key == QStringLiteral("center"))
+    {
+        Q_ASSERT(value.isString());
+        m_center = value.toString();
+        return true;
+    }
+
+    if(key == QStringLiteral("motionAngle"))
+    {
+        Q_ASSERT(value.isDouble());
+        m_motionAngle = value.toDouble();
+        return true;
+    }
+
+    if(key == QStringLiteral("radius"))
+    {
+        Q_ASSERT(value.isDouble());
+        m_radius = value.toDouble();
+        return true;
+    }
+
+    if(key == QStringLiteral("type"))
+    {
+        Q_ASSERT(value.isDouble());
+        m_type = value.toDouble();
+        return true;
+    }
+
+    return BaseContainer::parseProperty(key, value);
+}
diff --git a/sketchlib/container/blur.h b/sketchlib/container/blur.h
new file mode 100644
index 0000000..3f82499
--- /dev/null
+++ b/sketchlib/container/blur.h
@@ -0,0 +1,36 @@
+#pragma once
+
+#include "basecontainer.h"
+#include "sketchlib_global.h"
+
+class QJsonObject;
+
+class SKETCHLIB_EXPORT Blur : public BaseContainer
+{
+    Q_OBJECT
+    Q_PROPERTY(bool isEnabled READ isEnabled CONSTANT)
+    Q_PROPERTY(QString center READ center CONSTANT)
+    Q_PROPERTY(double motionAngle READ motionAngle CONSTANT)
+    Q_PROPERTY(double radius READ radius CONSTANT)
+    Q_PROPERTY(double type READ type CONSTANT)
+
+public:
+    Q_INVOKABLE explicit Blur(QObject *parent = Q_NULLPTR);
+
+    bool isEnabled() const;
+    const QString &center() const;
+    double motionAngle() const;
+    double radius() const;
+    double type() const;
+
+protected:
+    // BaseContainer interface
+    virtual bool parseProperty(const QString &key, const QJsonValue &value) Q_DECL_OVERRIDE;
+
+private:
+    bool m_isEnabled;
+    QString m_center;
+    double m_motionAngle;
+    double m_radius;
+    double m_type;
+};
diff --git a/sketchlib/container/border.cpp b/sketchlib/container/border.cpp
new file mode 100644
index 0000000..336ccc6
--- /dev/null
+++ b/sketchlib/container/border.cpp
@@ -0,0 +1,83 @@
+#include "border.h"
+
+#include <QJsonValue>
+#include <QJsonObject>
+
+#include "containerfactory.h"
+
+#include "color.h"
+
+Border::Border(QObject *parent) :
+    BaseContainer(parent),
+    m_color(Q_NULLPTR),
+    m_fillType(FillType::FlatColor),
+    m_isEnabled(false),
+    m_position(Position::Inside),
+    m_thickness(0.)
+{
+}
+
+Color *Border::color() const
+{
+    return m_color;
+}
+
+Border::FillType Border::fillType() const
+{
+    return m_fillType;
+}
+
+bool Border::isEnabled() const
+{
+    return m_isEnabled;
+}
+
+Border::Position Border::position() const
+{
+    return m_position;
+}
+
+double Border::thickness() const
+{
+    return m_thickness;
+}
+
+bool Border::parseProperty(const QString &key, const QJsonValue &value)
+{
+    if(key == QStringLiteral("color"))
+    {
+        Q_ASSERT(value.isObject());
+        m_color = ContainerFactory::createContainer<Color>(value.toObject(), this);
+        return true;
+    }
+
+    if(key == QStringLiteral("fillType"))
+    {
+        Q_ASSERT(value.isDouble());
+        m_fillType = FillType(int(value.toDouble()));
+        return true;
+    }
+
+    if(key == QStringLiteral("isEnabled"))
+    {
+        Q_ASSERT(value.isBool());
+        m_isEnabled = value.toBool();
+        return true;
+    }
+
+    if(key == QStringLiteral("position"))
+    {
+        Q_ASSERT(value.isDouble());
+        m_position = Position(int(value.toDouble()));
+        return true;
+    }
+
+    if(key == QStringLiteral("thickness"))
+    {
+        Q_ASSERT(value.isDouble());
+        m_thickness = value.toDouble();
+        return true;
+    }
+
+    return BaseContainer::parseProperty(key, value);
+}
diff --git a/sketchlib/container/border.h b/sketchlib/container/border.h
new file mode 100644
index 0000000..0c2942e
--- /dev/null
+++ b/sketchlib/container/border.h
@@ -0,0 +1,53 @@
+#pragma once
+
+#include "basecontainer.h"
+#include "sketchlib_global.h"
+
+class QJsonObject;
+
+class Color;
+
+class SKETCHLIB_EXPORT Border : public BaseContainer
+{
+    Q_OBJECT
+    Q_PROPERTY(Color* color READ color CONSTANT)
+    Q_PROPERTY(FillType fillType READ fillType CONSTANT)
+    Q_PROPERTY(bool isEnabled READ isEnabled CONSTANT)
+    Q_PROPERTY(Position position READ position CONSTANT)
+    Q_PROPERTY(double thickness READ thickness CONSTANT)
+
+public:
+    Q_INVOKABLE explicit Border(QObject *parent = Q_NULLPTR);
+
+    enum class FillType {
+        FlatColor = 0,
+        LinearGradient = 1,
+        RadialGradient = 2,
+        AngularGradient = 3
+    };
+    Q_ENUM(FillType)
+
+    enum class Position {
+        Inside = 0,
+        Center = 1,
+        Outside = 2
+    };
+    Q_ENUM(Position)
+
+    Color *color() const;
+    FillType fillType() const;
+    bool isEnabled() const;
+    Position position() const;
+    double thickness() const;
+
+protected:
+    // BaseContainer interface
+    virtual bool parseProperty(const QString &key, const QJsonValue &value) Q_DECL_OVERRIDE;
+
+private:
+    Color *m_color;
+    FillType m_fillType;
+    bool m_isEnabled;
+    Position m_position;
+    double m_thickness;
+};
diff --git a/sketchlib/container/borderoptions.cpp b/sketchlib/container/borderoptions.cpp
new file mode 100644
index 0000000..04f820f
--- /dev/null
+++ b/sketchlib/container/borderoptions.cpp
@@ -0,0 +1,66 @@
+#include "borderoptions.h"
+
+#include <QJsonValue>
+#include <QJsonArray>
+
+BorderOptions::BorderOptions(QObject *parent) :
+    BaseContainer(parent)
+{
+}
+
+const QList<double> &BorderOptions::dashPattern() const
+{
+    return m_dashPattern;
+}
+
+bool BorderOptions::isEnabled() const
+{
+    return m_isEnabled;
+}
+
+double BorderOptions::lineCapStyle() const
+{
+    return m_lineCapStyle;
+}
+
+double BorderOptions::lineJoinStyle() const
+{
+    return m_lineJoinStyle;
+}
+
+bool BorderOptions::parseProperty(const QString &key, const QJsonValue &value)
+{
+    if(key == QStringLiteral("dashPattern"))
+    {
+        Q_ASSERT(value.isArray());
+        for(auto dashPatternValue : value.toArray())
+        {
+            Q_ASSERT(dashPatternValue.isDouble());
+            m_dashPattern.append(dashPatternValue.toDouble());
+        }
+        return true;
+    }
+
+    if(key == QStringLiteral("isEnabled"))
+    {
+        Q_ASSERT(value.isBool());
+        m_isEnabled = value.toBool();
+        return true;
+    }
+
+    if(key == QStringLiteral("lineCapStyle"))
+    {
+        Q_ASSERT(value.isDouble());
+        m_lineCapStyle = value.toDouble();
+        return true;
+    }
+
+    if(key == QStringLiteral("lineJoinStyle"))
+    {
+        Q_ASSERT(value.isDouble());
+        m_lineJoinStyle = value.toDouble();
+        return true;
+    }
+
+    return BaseContainer::parseProperty(key, value);
+}
diff --git a/sketchlib/container/borderoptions.h b/sketchlib/container/borderoptions.h
new file mode 100644
index 0000000..8bf827a
--- /dev/null
+++ b/sketchlib/container/borderoptions.h
@@ -0,0 +1,33 @@
+#pragma once
+
+#include "basecontainer.h"
+#include "sketchlib_global.h"
+
+class QJsonObject;
+
+class SKETCHLIB_EXPORT BorderOptions : public BaseContainer
+{
+    Q_OBJECT
+    Q_PROPERTY(QList<double> dashPattern READ dashPattern CONSTANT)
+    Q_PROPERTY(bool isEnabled READ isEnabled CONSTANT)
+    Q_PROPERTY(double lineCapStyle READ lineCapStyle CONSTANT)
+    Q_PROPERTY(double lineJoinStyle READ lineJoinStyle CONSTANT)
+
+public:
+    Q_INVOKABLE explicit BorderOptions(QObject *parent = Q_NULLPTR);
+
+    const QList<double> &dashPattern() const;
+    bool isEnabled() const;
+    double lineCapStyle() const;
+    double lineJoinStyle() const;
+
+protected:
+    // BaseContainer interface
+    virtual bool parseProperty(const QString &key, const QJsonValue &value) Q_DECL_OVERRIDE;
+
+private:
+    QList<double> m_dashPattern;
+    bool m_isEnabled;
+    double m_lineCapStyle;
+    double m_lineJoinStyle;
+};
diff --git a/sketchlib/container/color.cpp b/sketchlib/container/color.cpp
new file mode 100644
index 0000000..eefe469
--- /dev/null
+++ b/sketchlib/container/color.cpp
@@ -0,0 +1,65 @@
+#include "color.h"
+
+#include <QJsonValue>
+
+Color::Color(QObject *parent) :
+    BaseContainer(parent),
+    m_alpha(0.),
+    m_blue(0.),
+    m_green(0.),
+    m_red(0.)
+{
+}
+
+double Color::alpha() const
+{
+    return m_alpha;
+}
+
+double Color::blue() const
+{
+    return m_blue;
+}
+
+double Color::green() const
+{
+    return m_green;
+}
+
+double Color::red() const
+{
+    return m_red;
+}
+
+bool Color::parseProperty(const QString &key, const QJsonValue &value)
+{
+    if(key == QStringLiteral("alpha"))
+    {
+        Q_ASSERT(value.isDouble());
+        m_alpha = value.toDouble();
+        return true;
+    }
+
+    if(key == QStringLiteral("blue"))
+    {
+        Q_ASSERT(value.isDouble());
+        m_blue = value.toDouble();
+        return true;
+    }
+
+    if(key == QStringLiteral("green"))
+    {
+        Q_ASSERT(value.isDouble());
+        m_green = value.toDouble();
+        return true;
+    }
+
+    if(key == QStringLiteral("red"))
+    {
+        Q_ASSERT(value.isDouble());
+        m_red = value.toDouble();
+        return true;
+    }
+
+    return BaseContainer::parseProperty(key, value);
+}
diff --git a/sketchlib/container/color.h b/sketchlib/container/color.h
new file mode 100644
index 0000000..560bc6a
--- /dev/null
+++ b/sketchlib/container/color.h
@@ -0,0 +1,33 @@
+#pragma once
+
+#include "basecontainer.h"
+#include "sketchlib_global.h"
+
+class QJsonObject;
+
+class SKETCHLIB_EXPORT Color : public BaseContainer
+{
+    Q_OBJECT
+    Q_PROPERTY(double alpha READ alpha CONSTANT)
+    Q_PROPERTY(double blue READ blue CONSTANT)
+    Q_PROPERTY(double green READ green CONSTANT)
+    Q_PROPERTY(double red READ red CONSTANT)
+
+public:
+    Q_INVOKABLE explicit Color(QObject *parent = Q_NULLPTR);
+
+    double alpha() const;
+    double blue() const;
+    double green() const;
+    double red() const;
+
+protected:
+    // BaseContainer interface
+    virtual bool parseProperty(const QString &key, const QJsonValue &value) Q_DECL_OVERRIDE;
+
+private:
+    double m_alpha;
+    double m_blue;
+    double m_green;
+    double m_red;
+};
diff --git a/sketchlib/container/document.cpp b/sketchlib/container/document.cpp
new file mode 100644
index 0000000..8304d52
--- /dev/null
+++ b/sketchlib/container/document.cpp
@@ -0,0 +1,160 @@
+#include "document.h"
+
+#include <QJsonValue>
+#include <QJsonObject>
+#include <QJsonArray>
+
+#include "containerfactory.h"
+
+#include "assetcollection.h"
+#include "msimmutableforeignsymbol.h"
+#include "sharedstylecontainer.h"
+#include "symbolcontainer.h"
+#include "sharedtextstylecontainer.h"
+#include "msjsonfilereference.h"
+
+Document::Document(QObject *parent) :
+    BaseContainer(parent),
+    m_assets(Q_NULLPTR),
+    m_colorSpace(0.),
+    m_currentPageIndex(0.),
+    m_enableLayerInteraction(false),
+    m_enableSliceInteraction(false),
+    m_layerStyles(Q_NULLPTR),
+    m_layerSymbols(Q_NULLPTR),
+    m_layerTextStyles(Q_NULLPTR)
+{
+}
+
+AssetCollection *Document::assets() const
+{
+    return m_assets;
+}
+
+double Document::colorSpace() const
+{
+    return m_colorSpace;
+}
+
+double Document::currentPageIndex() const
+{
+    return m_currentPageIndex;
+}
+
+bool Document::enableLayerInteraction() const
+{
+    return m_enableLayerInteraction;
+}
+
+bool Document::enableSliceInteraction() const
+{
+    return m_enableSliceInteraction;
+}
+
+const QList<MSImmutableForeignSymbol *> &Document::foreignSymbols() const
+{
+    return m_foreignSymbols;
+}
+
+SharedStyleContainer *Document::layerStyles() const
+{
+    return m_layerStyles;
+}
+
+SymbolContainer *Document::layerSymbols() const
+{
+    return m_layerSymbols;
+}
+
+SharedTextStyleContainer *Document::layerTextStyles() const
+{
+    return m_layerTextStyles;
+}
+
+const QList<MSJSONFileReference *> &Document::pages() const
+{
+    return m_pages;
+}
+
+bool Document::parseProperty(const QString &key, const QJsonValue &value)
+{
+    if(key == QStringLiteral("assets"))
+    {
+        Q_ASSERT(value.isObject());
+        m_assets = ContainerFactory::createContainer<AssetCollection>(value.toObject(), this);
+        return true;
+    }
+
+    if(key == QStringLiteral("colorSpace"))
+    {
+        Q_ASSERT(value.isDouble());
+        m_colorSpace = value.toDouble();
+        return true;
+    }
+
+    if(key == QStringLiteral("currentPageIndex"))
+    {
+        Q_ASSERT(value.isDouble());
+        m_currentPageIndex = value.toDouble();
+        return true;
+    }
+
+    if(key == QStringLiteral("enableLayerInteraction"))
+    {
+        Q_ASSERT(value.isBool());
+        m_enableLayerInteraction = value.toBool();
+        return true;
+    }
+
+    if(key == QStringLiteral("enableSliceInteraction"))
+    {
+        Q_ASSERT(value.isBool());
+        m_enableSliceInteraction = value.toBool();
+        return true;
+    }
+
+    if(key == QStringLiteral("foreignSymbols"))
+    {
+        Q_ASSERT(value.isArray());
+        for(auto pageValue : value.toArray())
+        {
+            Q_ASSERT(pageValue.isObject());
+            m_foreignSymbols.append(ContainerFactory::createContainer<MSImmutableForeignSymbol>(pageValue.toObject(), this));
+        }
+        return true;
+    }
+
+    if(key == QStringLiteral("layerStyles"))
+    {
+        Q_ASSERT(value.isObject());
+        m_layerStyles = ContainerFactory::createContainer<SharedStyleContainer>(value.toObject(), this);
+        return true;
+    }
+
+    if(key == QStringLiteral("layerSymbols"))
+    {
+        Q_ASSERT(value.isObject());
+        m_layerSymbols = ContainerFactory::createContainer<SymbolContainer>(value.toObject(), this);
+        return true;
+    }
+
+    if(key == QStringLiteral("layerTextStyles"))
+    {
+        Q_ASSERT(value.isObject());
+        m_layerTextStyles = ContainerFactory::createContainer<SharedTextStyleContainer>(value.toObject(), this);
+        return true;
+    }
+
+    if(key == QStringLiteral("pages"))
+    {
+        Q_ASSERT(value.isArray());
+        for(auto pageValue : value.toArray())
+        {
+            Q_ASSERT(pageValue.isObject());
+            m_pages.append(ContainerFactory::createContainer<MSJSONFileReference>(pageValue.toObject(), this));
+        }
+        return true;
+    }
+
+    return BaseContainer::parseProperty(key, value);
+}
diff --git a/sketchlib/container/document.h b/sketchlib/container/document.h
new file mode 100644
index 0000000..d94fc1d
--- /dev/null
+++ b/sketchlib/container/document.h
@@ -0,0 +1,58 @@
+#pragma once
+
+#include "basecontainer.h"
+#include "sketchlib_global.h"
+
+class QJsonObject;
+
+class AssetCollection;
+class MSImmutableForeignSymbol;
+class SharedStyleContainer;
+class SymbolContainer;
+class SharedTextStyleContainer;
+class MSJSONFileReference;
+
+class SKETCHLIB_EXPORT Document : public BaseContainer
+{
+    Q_OBJECT
+    Q_PROPERTY(AssetCollection* assets READ assets CONSTANT)
+    Q_PROPERTY(double colorSpace READ colorSpace CONSTANT)
+    Q_PROPERTY(double currentPageIndex READ currentPageIndex CONSTANT)
+    Q_PROPERTY(bool enableLayerInteraction READ enableLayerInteraction CONSTANT)
+    Q_PROPERTY(bool enableSliceInteraction READ enableSliceInteraction CONSTANT)
+    Q_PROPERTY(QList<MSImmutableForeignSymbol*> foreignSymbols READ foreignSymbols CONSTANT)
+    Q_PROPERTY(SharedStyleContainer* layerStyles READ layerStyles CONSTANT)
+    Q_PROPERTY(SymbolContainer* layerSymbols READ layerSymbols CONSTANT)
+    Q_PROPERTY(SharedTextStyleContainer* layerTextStyles READ layerTextStyles CONSTANT)
+    Q_PROPERTY(QList<MSJSONFileReference*> pages READ pages CONSTANT)
+
+public:
+    Q_INVOKABLE explicit Document(QObject *parent = Q_NULLPTR);
+
+    AssetCollection *assets() const;
+    double colorSpace() const;
+    double currentPageIndex() const;
+    bool enableLayerInteraction() const;
+    bool enableSliceInteraction() const;
+    const QList<MSImmutableForeignSymbol*> &foreignSymbols() const;
+    SharedStyleContainer *layerStyles() const;
+    SymbolContainer *layerSymbols() const;
+    SharedTextStyleContainer *layerTextStyles() const;
+    const QList<MSJSONFileReference*> &pages() const;
+
+protected:
+    // BaseContainer interface
+    virtual bool parseProperty(const QString &key, const QJsonValue &value) Q_DECL_OVERRIDE;
+
+private:
+    AssetCollection *m_assets;
+    double m_colorSpace;
+    double m_currentPageIndex;
+    bool m_enableLayerInteraction;
+    bool m_enableSliceInteraction;
+    QList<MSImmutableForeignSymbol*> m_foreignSymbols;
+    SharedStyleContainer *m_layerStyles;
+    SymbolContainer *m_layerSymbols;
+    SharedTextStyleContainer *m_layerTextStyles;
+    QList<MSJSONFileReference*> m_pages;
+};
diff --git a/sketchlib/container/exportformat.cpp b/sketchlib/container/exportformat.cpp
new file mode 100644
index 0000000..c55baf4
--- /dev/null
+++ b/sketchlib/container/exportformat.cpp
@@ -0,0 +1,85 @@
+#include "exportformat.h"
+
+#include <QJsonValue>
+
+ExportFormat::ExportFormat(QObject *parent) :
+    BaseContainer(parent)
+{
+}
+
+double ExportFormat::absoluteSize() const
+{
+    return m_absoluteSize;
+}
+
+const QString &ExportFormat::fileFormat() const
+{
+    return m_fileFormat;
+}
+
+const QString &ExportFormat::name() const
+{
+    return m_name;
+}
+
+double ExportFormat::namingScheme() const
+{
+    return m_namingScheme;
+}
+
+double ExportFormat::scale() const
+{
+    return m_scale;
+}
+
+double ExportFormat::visibleScaleType() const
+{
+    return m_visibleScaleType;
+}
+
+bool ExportFormat::parseProperty(const QString &key, const QJsonValue &value)
+{
+    if(key == QStringLiteral("absoluteSize"))
+    {
+        Q_ASSERT(value.isDouble());
+        m_absoluteSize = value.toDouble();
+        return true;
+    }
+
+    if(key == QStringLiteral("fileFormat"))
+    {
+        Q_ASSERT(value.isString());
+        m_fileFormat = value.toString();
+        return true;
+    }
+
+    if(key == QStringLiteral("name"))
+    {
+        Q_ASSERT(value.isString());
+        m_name = value.toString();
+        return true;
+    }
+
+    if(key == QStringLiteral("namingScheme"))
+    {
+        Q_ASSERT(value.isDouble());
+        m_namingScheme = value.toDouble();
+        return true;
+    }
+
+    if(key == QStringLiteral("scale"))
+    {
+        Q_ASSERT(value.isDouble());
+        m_scale = value.toDouble();
+        return true;
+    }
+
+    if(key == QStringLiteral("visibleScaleType"))
+    {
+        Q_ASSERT(value.isDouble());
+        m_visibleScaleType = value.toDouble();
+        return true;
+    }
+
+    return BaseContainer::parseProperty(key, value);
+}
diff --git a/sketchlib/container/exportformat.h b/sketchlib/container/exportformat.h
new file mode 100644
index 0000000..293a702
--- /dev/null
+++ b/sketchlib/container/exportformat.h
@@ -0,0 +1,39 @@
+#pragma once
+
+#include "basecontainer.h"
+#include "sketchlib_global.h"
+
+class QJsonObject;
+
+class SKETCHLIB_EXPORT ExportFormat : public BaseContainer
+{
+    Q_OBJECT
+    Q_PROPERTY(double absoluteSize READ absoluteSize CONSTANT)
+    Q_PROPERTY(QString fileFormat READ fileFormat CONSTANT)
+    Q_PROPERTY(QString name READ name CONSTANT)
+    Q_PROPERTY(double namingScheme READ namingScheme CONSTANT)
+    Q_PROPERTY(double scale READ scale CONSTANT)
+    Q_PROPERTY(double visibleScaleType READ visibleScaleType CONSTANT)
+
+public:
+    Q_INVOKABLE explicit ExportFormat(QObject *parent = Q_NULLPTR);
+
+    double absoluteSize() const;
+    const QString &fileFormat() const;
+    const QString &name() const;
+    double namingScheme() const;
+    double scale() const;
+    double visibleScaleType() const;
+
+protected:
+    // BaseContainer interface
+    virtual bool parseProperty(const QString &key, const QJsonValue &value) Q_DECL_OVERRIDE;
+
+private:
+    double m_absoluteSize;
+    QString m_fileFormat;
+    QString m_name;
+    double m_namingScheme;
+    double m_scale;
+    double m_visibleScaleType;
+};
diff --git a/sketchlib/container/exportoptions.cpp b/sketchlib/container/exportoptions.cpp
new file mode 100644
index 0000000..9455f5d
--- /dev/null
+++ b/sketchlib/container/exportoptions.cpp
@@ -0,0 +1,75 @@
+#include "exportoptions.h"
+
+#include <QDebug>
+#include <QJsonValue>
+#include <QJsonObject>
+#include <QJsonArray>
+
+#include <QJsonDocument>
+
+#include "containerfactory.h"
+
+#include "exportformat.h"
+
+ExportOptions::ExportOptions(QObject *parent) :
+    BaseContainer(parent),
+    m_layerOptions(0.),
+    m_shouldTrim(false)
+{
+}
+
+const QList<ExportFormat *> &ExportOptions::exportFormats() const
+{
+    return m_exportFormats;
+}
+
+double ExportOptions::layerOptions() const
+{
+    return m_layerOptions;
+}
+
+bool ExportOptions::shouldTrim() const
+{
+    return m_shouldTrim;
+}
+
+bool ExportOptions::parseProperty(const QString &key, const QJsonValue &value)
+{
+    if(key == QStringLiteral("exportFormats"))
+    {
+        Q_ASSERT(value.isArray());
+        for(auto colorValue : value.toArray())
+        {
+            Q_ASSERT(colorValue.isObject());
+            m_exportFormats.append(ContainerFactory::createContainer<ExportFormat>(colorValue.toObject(), this));
+        }
+        return true;
+    }
+
+    if(key == QStringLiteral("includedLayerIds"))
+    {
+        Q_ASSERT(value.isArray());
+        for(auto includedLayerIdValue : value.toArray())
+        {
+            //TODO
+            //qWarning() << "includedLayerIds not implemented";
+        }
+        return true;
+    }
+
+    if(key == QStringLiteral("layerOptions"))
+    {
+        Q_ASSERT(value.isDouble());
+        m_layerOptions = value.toDouble();
+        return true;
+    }
+
+    if(key == QStringLiteral("shouldTrim"))
+    {
+        Q_ASSERT(value.isBool());
+        m_shouldTrim = value.toBool();
+        return true;
+    }
+
+    return BaseContainer::parseProperty(key, value);
+}
diff --git a/sketchlib/container/exportoptions.h b/sketchlib/container/exportoptions.h
new file mode 100644
index 0000000..7ff5370
--- /dev/null
+++ b/sketchlib/container/exportoptions.h
@@ -0,0 +1,35 @@
+#pragma once
+
+#include "basecontainer.h"
+#include "sketchlib_global.h"
+
+class QJsonObject;
+
+class ExportFormat;
+
+class SKETCHLIB_EXPORT ExportOptions : public BaseContainer
+{
+    Q_OBJECT
+    Q_PROPERTY(QList<ExportFormat*> exportFormats READ exportFormats CONSTANT)
+    //TODO includedLayerIds
+    Q_PROPERTY(double layerOptions READ layerOptions CONSTANT)
+    Q_PROPERTY(bool shouldTrim READ shouldTrim CONSTANT)
+
+public:
+    Q_INVOKABLE explicit ExportOptions(QObject *parent = Q_NULLPTR);
+
+    const QList<ExportFormat*> &exportFormats() const;
+    //TODO includedLayerIds
+    double layerOptions() const;
+    bool shouldTrim() const;
+
+protected:
+    // BaseContainer interface
+    virtual bool parseProperty(const QString &key, const QJsonValue &value) Q_DECL_OVERRIDE;
+
+private:
+    QList<ExportFormat*> m_exportFormats;
+    //TODO includedLayerIds
+    double m_layerOptions;
+    bool m_shouldTrim;
+};
diff --git a/sketchlib/container/fill.cpp b/sketchlib/container/fill.cpp
new file mode 100644
index 0000000..a0262c3
--- /dev/null
+++ b/sketchlib/container/fill.cpp
@@ -0,0 +1,144 @@
+#include "fill.h"
+
+#include <QJsonValue>
+#include <QJsonObject>
+
+#include "containerfactory.h"
+
+#include "color.h"
+#include "graphicscontextsettings.h"
+#include "msjsonfilereference.h"
+#include "gradient.h"
+
+Fill::Fill(QObject *parent) :
+    BaseContainer(parent),
+    m_color(Q_NULLPTR),
+    m_fillType(0.),
+    m_gradient(Q_NULLPTR)
+{
+}
+
+Color *Fill::color() const
+{
+    return m_color;
+}
+
+GraphicsContextSettings *Fill::contextSettings() const
+{
+    return m_contextSettings;
+}
+
+double Fill::fillType() const
+{
+    return m_fillType;
+}
+
+MSJSONFileReference *Fill::image() const
+{
+    return m_image;
+}
+
+Gradient *Fill::gradient() const
+{
+    return m_gradient;
+}
+
+bool Fill::isEnabled() const
+{
+    return m_isEnabled;
+}
+
+double Fill::noiseIndex() const
+{
+    return m_noiseIndex;
+}
+
+double Fill::noiseIntensity() const
+{
+    return m_noiseIntensity;
+}
+
+double Fill::patternFillType() const
+{
+    return m_patternFillType;
+}
+
+double Fill::patternTileScale() const
+{
+    return m_patternTileScale;
+}
+
+bool Fill::parseProperty(const QString &key, const QJsonValue &value)
+{
+    if(key == QStringLiteral("color"))
+    {
+        Q_ASSERT(value.isObject());
+        m_color = ContainerFactory::createContainer<Color>(value.toObject(), this);
+        return true;
+    }
+
+    if(key == QStringLiteral("contextSettings"))
+    {
+        Q_ASSERT(value.isObject());
+        m_contextSettings = ContainerFactory::createContainer<GraphicsContextSettings>(value.toObject(), this);
+        return true;
+    }
+
+    if(key == QStringLiteral("fillType"))
+    {
+        Q_ASSERT(value.isDouble());
+        m_fillType = value.toDouble();
+        return true;
+    }
+
+    if(key == QStringLiteral("image"))
+    {
+        Q_ASSERT(value.isObject());
+        m_image = ContainerFactory::createContainer<MSJSONFileReference>(value.toObject(), this);
+        return true;
+    }
+
+    if(key == QStringLiteral("gradient"))
+    {
+        Q_ASSERT(value.isObject());
+        m_gradient = ContainerFactory::createContainer<Gradient>(value.toObject(), this);
+        return true;
+    }
+
+    if(key == QStringLiteral("isEnabled"))
+    {
+        Q_ASSERT(value.isBool());
+        m_isEnabled = value.toBool();
+        return true;
+    }
+
+    if(key == QStringLiteral("noiseIndex"))
+    {
+        Q_ASSERT(value.isDouble());
+        m_noiseIndex = value.toDouble();
+        return true;
+    }
+
+    if(key == QStringLiteral("noiseIntensity"))
+    {
+        Q_ASSERT(value.isDouble());
+        m_noiseIntensity = value.toDouble();
+        return true;
+    }
+
+    if(key == QStringLiteral("patternFillType"))
+    {
+        Q_ASSERT(value.isDouble());
+        m_patternFillType = value.toDouble();
+        return true;
+    }
+
+    if(key == QStringLiteral("patternTileScale"))
+    {
+        Q_ASSERT(value.isDouble());
+        m_patternTileScale = value.toDouble();
+        return true;
+    }
+
+    return BaseContainer::parseProperty(key, value);
+}
diff --git a/sketchlib/container/fill.h b/sketchlib/container/fill.h
new file mode 100644
index 0000000..2c9c7df
--- /dev/null
+++ b/sketchlib/container/fill.h
@@ -0,0 +1,56 @@
+#pragma once
+
+#include "basecontainer.h"
+#include "sketchlib_global.h"
+
+class QJsonObject;
+
+class Color;
+class GraphicsContextSettings;
+class MSJSONFileReference;
+class Gradient;
+
+class SKETCHLIB_EXPORT Fill : public BaseContainer
+{
+    Q_OBJECT
+    Q_PROPERTY(Color* color READ color CONSTANT)
+    Q_PROPERTY(GraphicsContextSettings* contextSettings READ contextSettings CONSTANT)
+    Q_PROPERTY(double fillType READ fillType CONSTANT)
+    Q_PROPERTY(MSJSONFileReference* image READ image CONSTANT)
+    Q_PROPERTY(Gradient* gradient READ gradient CONSTANT)
+    Q_PROPERTY(bool isEnabled READ isEnabled CONSTANT)
+    Q_PROPERTY(double noiseIndex READ noiseIndex CONSTANT)
+    Q_PROPERTY(double noiseIntensity READ noiseIntensity CONSTANT)
+    Q_PROPERTY(double patternFillType READ patternFillType CONSTANT)
+    Q_PROPERTY(double patternTileScale READ patternTileScale CONSTANT)
+
+public:
+    Q_INVOKABLE explicit Fill(QObject *parent = Q_NULLPTR);
+
+    Color *color() const;
+    GraphicsContextSettings *contextSettings() const;
+    double fillType() const;
+    MSJSONFileReference *image() const;
+    Gradient *gradient() const;
+    bool isEnabled() const;
+    double noiseIndex() const;
+    double noiseIntensity() const;
+    double patternFillType() const;
+    double patternTileScale() const;
+
+protected:
+    // BaseContainer interface
+    virtual bool parseProperty(const QString &key, const QJsonValue &value) Q_DECL_OVERRIDE;
+
+private:
+    Color *m_color;
+    GraphicsContextSettings *m_contextSettings;
+    double m_fillType;
+    MSJSONFileReference *m_image;
+    Gradient *m_gradient;
+    bool m_isEnabled;
+    double m_noiseIndex;
+    double m_noiseIntensity;
+    double m_patternFillType;
+    double m_patternTileScale;
+};
diff --git a/sketchlib/container/gradient.cpp b/sketchlib/container/gradient.cpp
new file mode 100644
index 0000000..525b24f
--- /dev/null
+++ b/sketchlib/container/gradient.cpp
@@ -0,0 +1,98 @@
+#include "gradient.h"
+
+#include <QJsonValue>
+#include <QJsonObject>
+#include <QJsonArray>
+
+#include "containerfactory.h"
+
+#include "gradientstop.h"
+
+Gradient::Gradient(QObject *parent) :
+    BaseContainer(parent),
+    m_elipseLength(0.),
+    m_gradientType(0.),
+    m_shouldSmoothenOpacity(false)
+{
+}
+
+double Gradient::elipseLength() const
+{
+    return m_elipseLength;
+}
+
+const QString &Gradient::from() const
+{
+    return m_from;
+}
+
+double Gradient::gradientType() const
+{
+    return m_gradientType;
+}
+
+bool Gradient::shouldSmoothenOpacity() const
+{
+    return m_shouldSmoothenOpacity;
+}
+
+const QList<GradientStop *> &Gradient::stops() const
+{
+    return m_stops;
+}
+
+const QString &Gradient::to() const
+{
+    return m_to;
+}
+
+bool Gradient::parseProperty(const QString &key, const QJsonValue &value)
+{
+    if(key == QStringLiteral("elipseLength"))
+    {
+        Q_ASSERT(value.isDouble());
+        m_elipseLength = value.toDouble();
+        return true;
+    }
+
+    if(key == QStringLiteral("from"))
+    {
+        Q_ASSERT(value.isString());
+        m_from = value.toString();
+        return true;
+    }
+
+    if(key == QStringLiteral("gradientType"))
+    {
+        Q_ASSERT(value.isDouble());
+        m_gradientType = value.toDouble();
+        return true;
+    }
+
+    if(key == QStringLiteral("shouldSmoothenOpacity"))
+    {
+        Q_ASSERT(value.isBool());
+        m_shouldSmoothenOpacity = value.toBool();
+        return true;
+    }
+
+    if(key == QStringLiteral("stops"))
+    {
+        Q_ASSERT(value.isArray());
+        for(auto gradientStopValue : value.toArray())
+        {
+            Q_ASSERT(gradientStopValue.isObject());
+            m_stops.append(ContainerFactory::createContainer<GradientStop>(gradientStopValue.toObject(), this));
+        }
+        return true;
+    }
+
+    if(key == QStringLiteral("to"))
+    {
+        Q_ASSERT(value.isString());
+        m_to = value.toString();
+        return true;
+    }
+
+    return BaseContainer::parseProperty(key, value);
+}
diff --git a/sketchlib/container/gradient.h b/sketchlib/container/gradient.h
new file mode 100644
index 0000000..bb152b4
--- /dev/null
+++ b/sketchlib/container/gradient.h
@@ -0,0 +1,41 @@
+#pragma once
+
+#include "basecontainer.h"
+#include "sketchlib_global.h"
+
+class QJsonObject;
+
+class GradientStop;
+
+class SKETCHLIB_EXPORT Gradient : public BaseContainer
+{
+    Q_OBJECT
+    Q_PROPERTY(double elipseLength READ elipseLength CONSTANT)
+    Q_PROPERTY(QString from READ from CONSTANT)
+    Q_PROPERTY(double gradientType READ gradientType CONSTANT)
+    Q_PROPERTY(bool shouldSmoothenOpacity READ shouldSmoothenOpacity CONSTANT)
+    Q_PROPERTY(QList<GradientStop*> stops READ stops CONSTANT)
+    Q_PROPERTY(QString to READ to CONSTANT)
+
+public:
+    Q_INVOKABLE explicit Gradient(QObject *parent = Q_NULLPTR);
+
+    double elipseLength() const;
+    const QString &from() const;
+    double gradientType() const;
+    bool shouldSmoothenOpacity() const;
+    const QList<GradientStop*> &stops() const;
+    const QString &to() const;
+
+protected:
+    // BaseContainer interface
+    virtual bool parseProperty(const QString &key, const QJsonValue &value) Q_DECL_OVERRIDE;
+
+private:
+    double m_elipseLength;
+    QString m_from;
+    double m_gradientType;
+    bool m_shouldSmoothenOpacity;
+    QList<GradientStop*> m_stops;
+    QString m_to;
+};
diff --git a/sketchlib/container/gradientstop.cpp b/sketchlib/container/gradientstop.cpp
new file mode 100644
index 0000000..669131c
--- /dev/null
+++ b/sketchlib/container/gradientstop.cpp
@@ -0,0 +1,42 @@
+#include "gradientstop.h"
+
+#include <QJsonValue>
+#include <QJsonObject>
+
+#include "containerfactory.h"
+
+#include "color.h"
+
+GradientStop::GradientStop(QObject *parent) :
+    BaseContainer(parent)
+{
+}
+
+Color *GradientStop::color() const
+{
+    return m_color;
+}
+
+double GradientStop::position() const
+{
+    return m_position;
+}
+
+bool GradientStop::parseProperty(const QString &key, const QJsonValue &value)
+{
+    if(key == QStringLiteral("color"))
+    {
+        Q_ASSERT(value.isObject());
+        m_color = ContainerFactory::createContainer<Color>(value.toObject(), this);
+        return true;
+    }
+
+    if(key == QStringLiteral("position"))
+    {
+        Q_ASSERT(value.isDouble());
+        m_position = value.toDouble();
+        return true;
+    }
+
+    return BaseContainer::parseProperty(key, value);
+}
diff --git a/sketchlib/container/gradientstop.h b/sketchlib/container/gradientstop.h
new file mode 100644
index 0000000..7ce224b
--- /dev/null
+++ b/sketchlib/container/gradientstop.h
@@ -0,0 +1,29 @@
+#pragma once
+
+#include "basecontainer.h"
+#include "sketchlib_global.h"
+
+class QJsonObject;
+
+class Color;
+
+class SKETCHLIB_EXPORT GradientStop : public BaseContainer
+{
+    Q_OBJECT
+    Q_PROPERTY(Color* color READ color CONSTANT)
+    Q_PROPERTY(double position READ position CONSTANT)
+
+public:
+    Q_INVOKABLE explicit GradientStop(QObject *parent = Q_NULLPTR);
+
+    Color *color() const;
+    double position() const;
+
+protected:
+    // BaseContainer interface
+    virtual bool parseProperty(const QString &key, const QJsonValue &value) Q_DECL_OVERRIDE;
+
+private:
+    Color *m_color;
+    double m_position;
+};
diff --git a/sketchlib/container/graphicscontextsettings.cpp b/sketchlib/container/graphicscontextsettings.cpp
new file mode 100644
index 0000000..f2cbae5
--- /dev/null
+++ b/sketchlib/container/graphicscontextsettings.cpp
@@ -0,0 +1,39 @@
+#include "graphicscontextsettings.h"
+
+#include <QJsonValue>
+
+GraphicsContextSettings::GraphicsContextSettings(QObject *parent) :
+    BaseContainer(parent),
+    m_blendMode(0.),
+    m_opacity(0.)
+{
+}
+
+double GraphicsContextSettings::blendMode() const
+{
+    return m_blendMode;
+}
+
+double GraphicsContextSettings::opacity() const
+{
+    return m_opacity;
+}
+
+bool GraphicsContextSettings::parseProperty(const QString &key, const QJsonValue &value)
+{
+    if(key == QStringLiteral("blendMode"))
+    {
+        Q_ASSERT(value.isDouble());
+        m_blendMode = value.toDouble();
+        return true;
+    }
+
+    if(key == QStringLiteral("opacity"))
+    {
+        Q_ASSERT(value.isDouble());
+        m_opacity = value.toDouble();
+        return true;
+    }
+
+    return BaseContainer::parseProperty(key, value);
+}
diff --git a/sketchlib/container/graphicscontextsettings.h b/sketchlib/container/graphicscontextsettings.h
new file mode 100644
index 0000000..e5f2f79
--- /dev/null
+++ b/sketchlib/container/graphicscontextsettings.h
@@ -0,0 +1,27 @@
+#pragma once
+
+#include "basecontainer.h"
+#include "sketchlib_global.h"
+
+class QJsonObject;
+
+class SKETCHLIB_EXPORT GraphicsContextSettings : public BaseContainer
+{
+    Q_OBJECT
+    Q_PROPERTY(double blendMode READ blendMode CONSTANT)
+    Q_PROPERTY(double opacity READ opacity CONSTANT)
+
+public:
+    Q_INVOKABLE explicit GraphicsContextSettings(QObject *parent = Q_NULLPTR);
+
+    double blendMode() const;
+    double opacity() const;
+
+protected:
+    // BaseContainer interface
+    virtual bool parseProperty(const QString &key, const QJsonValue &value) Q_DECL_OVERRIDE;
+
+private:
+    double m_blendMode;
+    double m_opacity;
+};
diff --git a/sketchlib/container/group.cpp b/sketchlib/container/group.cpp
new file mode 100644
index 0000000..fca107b
--- /dev/null
+++ b/sketchlib/container/group.cpp
@@ -0,0 +1,56 @@
+#include "group.h"
+
+#include <QDebug>
+#include <QJsonValue>
+#include <QJsonObject>
+#include <QJsonArray>
+
+#include "containerfactory.h"
+
+#include "layer.h"
+
+Group::Group(QObject *parent) :
+    Layer(parent),
+    m_hasClickThrough(false)
+{
+}
+
+const QList<Layer *> &Group::layers() const
+{
+    return m_layers;
+}
+
+bool Group::hasClickThrough() const
+{
+    return m_hasClickThrough;
+}
+
+bool Group::parseProperty(const QString &key, const QJsonValue &value)
+{
+    if(key == QStringLiteral("layers"))
+    {
+        Q_ASSERT(value.isArray());
+        for(auto layerValue : value.toArray())
+        {
+            Q_ASSERT(layerValue.isObject());
+            m_layers.append(ContainerFactory::createContainer<Layer>(layerValue.toObject()));
+        }
+        return true;
+    }
+
+    if(key == QStringLiteral("flow"))
+    {
+        Q_ASSERT(value.isObject());
+        //qWarning() << "flow not implemented";
+        return true;
+    }
+
+    if(key == QStringLiteral("hasClickThrough"))
+    {
+        Q_ASSERT(value.isBool());
+        m_hasClickThrough = value.toBool();
+        return true;
+    }
+
+    return Layer::parseProperty(key, value);
+}
diff --git a/sketchlib/container/group.h b/sketchlib/container/group.h
new file mode 100644
index 0000000..f1055b4
--- /dev/null
+++ b/sketchlib/container/group.h
@@ -0,0 +1,29 @@
+#pragma once
+
+#include "layer.h"
+#include "sketchlib_global.h"
+
+class QJsonObject;
+
+class Layer;
+
+class SKETCHLIB_EXPORT Group : public Layer
+{
+    Q_OBJECT
+    Q_PROPERTY(QList<Layer*> layers READ layers CONSTANT)
+    Q_PROPERTY(bool hasClickThrough READ hasClickThrough CONSTANT)
+
+public:
+    Q_INVOKABLE explicit Group(QObject *parent = Q_NULLPTR);
+
+    const QList<Layer*> &layers() const;
+    bool hasClickThrough() const;
+
+protected:
+    // BaseContainer interface
+    virtual bool parseProperty(const QString &key, const QJsonValue &value) Q_DECL_OVERRIDE;
+
+private:
+    QList<Layer*> m_layers;
+    bool m_hasClickThrough;
+};
diff --git a/sketchlib/container/imagecollection.cpp b/sketchlib/container/imagecollection.cpp
new file mode 100644
index 0000000..3615ebb
--- /dev/null
+++ b/sketchlib/container/imagecollection.cpp
@@ -0,0 +1,26 @@
+#include "imagecollection.h"
+
+#include <QDebug>
+#include <QJsonValue>
+#include <QJsonArray>
+
+ImageCollection::ImageCollection(QObject *parent) :
+    BaseContainer(parent)
+{
+}
+
+bool ImageCollection::parseProperty(const QString &key, const QJsonValue &value)
+{
+    if(key == QStringLiteral("images"))
+    {
+        Q_ASSERT(value.isObject());
+        for(auto imageValue : value.toArray())
+        {
+            //TODO
+            //qWarning() << "images not implemented";
+        }
+        return true;
+    }
+
+    return BaseContainer::parseProperty(key, value);
+}
diff --git a/sketchlib/container/imagecollection.h b/sketchlib/container/imagecollection.h
new file mode 100644
index 0000000..09d7614
--- /dev/null
+++ b/sketchlib/container/imagecollection.h
@@ -0,0 +1,24 @@
+#pragma once
+
+#include "basecontainer.h"
+#include "sketchlib_global.h"
+
+class QJsonObject;
+
+class SKETCHLIB_EXPORT ImageCollection : public BaseContainer
+{
+    Q_OBJECT
+    //TODO images
+
+public:
+    Q_INVOKABLE explicit ImageCollection(QObject *parent = Q_NULLPTR);
+
+    //TODO images
+
+protected:
+    // BaseContainer interface
+    virtual bool parseProperty(const QString &key, const QJsonValue &value) Q_DECL_OVERRIDE;
+
+private:
+    //TODO images
+};
diff --git a/sketchlib/container/innershadow.cpp b/sketchlib/container/innershadow.cpp
new file mode 100644
index 0000000..31147dc
--- /dev/null
+++ b/sketchlib/container/innershadow.cpp
@@ -0,0 +1,110 @@
+#include "innershadow.h"
+
+#include <QJsonValue>
+#include <QJsonObject>
+
+#include "containerfactory.h"
+
+#include "color.h"
+#include "graphicscontextsettings.h"
+
+InnerShadow::InnerShadow(QObject *parent) :
+    BaseContainer(parent),
+    m_isEnabled(false),
+    m_blurRadius(0.),
+    m_color(Q_NULLPTR),
+    m_contextSettings(Q_NULLPTR),
+    m_offsetX(0.),
+    m_offsetY(0.),
+    m_spread(0.)
+{
+}
+
+bool InnerShadow::isEnabled() const
+{
+    return m_isEnabled;
+}
+
+double InnerShadow::blurRadius() const
+{
+    return m_blurRadius;
+}
+
+Color *InnerShadow::color() const
+{
+    return m_color;
+}
+
+GraphicsContextSettings *InnerShadow::contextSettings() const
+{
+    return m_contextSettings;
+}
+
+double InnerShadow::offsetX() const
+{
+    return m_offsetX;
+}
+
+double InnerShadow::offsetY() const
+{
+    return m_offsetY;
+}
+
+double InnerShadow::spread() const
+{
+    return m_spread;
+}
+
+bool InnerShadow::parseProperty(const QString &key, const QJsonValue &value)
+{
+    if(key == QStringLiteral("isEnabled"))
+    {
+        Q_ASSERT(value.isBool());
+        m_isEnabled = value.toBool();
+        return true;
+    }
+
+    if(key == QStringLiteral("blurRadius"))
+    {
+        Q_ASSERT(value.isDouble());
+        m_blurRadius = value.toDouble();
+        return true;
+    }
+
+    if(key == QStringLiteral("color"))
+    {
+        Q_ASSERT(value.isObject());
+        m_color = ContainerFactory::createContainer<Color>(value.toObject());
+        return true;
+    }
+
+    if(key == QStringLiteral("contextSettings"))
+    {
+        Q_ASSERT(value.isObject());
+        m_contextSettings = ContainerFactory::createContainer<GraphicsContextSettings>(value.toObject());
+        return true;
+    }
+
+    if(key == QStringLiteral("offsetX"))
+    {
+        Q_ASSERT(value.isDouble());
+        m_offsetX = value.toDouble();
+        return true;
+    }
+
+    if(key == QStringLiteral("offsetY"))
+    {
+        Q_ASSERT(value.isDouble());
+        m_offsetY = value.toDouble();
+        return true;
+    }
+
+    if(key == QStringLiteral("spread"))
+    {
+        Q_ASSERT(value.isDouble());
+        m_spread = value.toDouble();
+        return true;
+    }
+
+    return BaseContainer::parseProperty(key, value);
+}
diff --git a/sketchlib/container/innershadow.h b/sketchlib/container/innershadow.h
new file mode 100644
index 0000000..772722f
--- /dev/null
+++ b/sketchlib/container/innershadow.h
@@ -0,0 +1,43 @@
+#pragma once
+
+#include "basecontainer.h"
+#include "sketchlib_global.h"
+
+class Color;
+class GraphicsContextSettings;
+
+class SKETCHLIB_EXPORT InnerShadow : public BaseContainer
+{
+    Q_OBJECT
+    Q_PROPERTY(bool isEnabled READ isEnabled CONSTANT)
+    Q_PROPERTY(double blurRadius READ blurRadius CONSTANT)
+    Q_PROPERTY(Color* color READ color CONSTANT)
+    Q_PROPERTY(GraphicsContextSettings* contextSettings READ contextSettings CONSTANT)
+    Q_PROPERTY(double offsetX READ offsetX CONSTANT)
+    Q_PROPERTY(double offsetY READ offsetY CONSTANT)
+    Q_PROPERTY(double spread READ spread CONSTANT)
+
+public:
+    Q_INVOKABLE explicit InnerShadow(QObject *parent = Q_NULLPTR);
+
+    bool isEnabled() const;
+    double blurRadius() const;
+    Color *color() const;
+    GraphicsContextSettings *contextSettings() const;
+    double offsetX() const;
+    double offsetY() const;
+    double spread() const;
+
+protected:
+    // BaseContainer interface
+    virtual bool parseProperty(const QString &key, const QJsonValue &value) Q_DECL_OVERRIDE;
+
+private:
+    bool m_isEnabled;
+    double m_blurRadius;
+    Color *m_color;
+    GraphicsContextSettings *m_contextSettings;
+    double m_offsetX;
+    double m_offsetY;
+    double m_spread;
+};
diff --git a/sketchlib/container/msimmutableforeignsymbol.cpp b/sketchlib/container/msimmutableforeignsymbol.cpp
new file mode 100644
index 0000000..26f5df9
--- /dev/null
+++ b/sketchlib/container/msimmutableforeignsymbol.cpp
@@ -0,0 +1,68 @@
+#include "msimmutableforeignsymbol.h"
+
+#include <QJsonValue>
+#include <QJsonObject>
+
+#include "containerfactory.h"
+
+#include "symbolmaster.h"
+
+MSImmutableForeignSymbol::MSImmutableForeignSymbol(QObject *parent) :
+    BaseContainer(parent),
+    m_originalMaster(Q_NULLPTR),
+    m_symbolMaster(Q_NULLPTR)
+{
+}
+
+const QString &MSImmutableForeignSymbol::libraryID() const
+{
+    return m_libraryID;
+}
+
+SymbolMaster *MSImmutableForeignSymbol::originalMaster() const
+{
+    return m_originalMaster;
+}
+
+const QString &MSImmutableForeignSymbol::sourceLibraryName() const
+{
+    return m_sourceLibraryName;
+}
+
+SymbolMaster *MSImmutableForeignSymbol::symbolMaster() const
+{
+    return m_symbolMaster;
+}
+
+bool MSImmutableForeignSymbol::parseProperty(const QString &key, const QJsonValue &value)
+{
+    if(key == QStringLiteral("libraryID"))
+    {
+        Q_ASSERT(value.isString());
+        m_libraryID = value.toString();
+        return true;
+    }
+
+    if(key == QStringLiteral("originalMaster"))
+    {
+        Q_ASSERT(value.isObject());
+        m_originalMaster = ContainerFactory::createContainer<SymbolMaster>(value.toObject(), this);
+        return true;
+    }
+
+    if(key == QStringLiteral("sourceLibraryName"))
+    {
+        Q_ASSERT(value.isString());
+        m_sourceLibraryName = value.toString();
+        return true;
+    }
+
+    if(key == QStringLiteral("symbolMaster"))
+    {
+        Q_ASSERT(value.isObject());
+        m_symbolMaster = ContainerFactory::createContainer<SymbolMaster>(value.toObject(), this);
+        return true;
+    }
+
+    return BaseContainer::parseProperty(key, value);
+}
diff --git a/sketchlib/container/msimmutableforeignsymbol.h b/sketchlib/container/msimmutableforeignsymbol.h
new file mode 100644
index 0000000..15a2a70
--- /dev/null
+++ b/sketchlib/container/msimmutableforeignsymbol.h
@@ -0,0 +1,35 @@
+#pragma once
+
+#include "basecontainer.h"
+#include "sketchlib_global.h"
+
+class QJsonObject;
+
+class SymbolMaster;
+
+class SKETCHLIB_EXPORT MSImmutableForeignSymbol : public BaseContainer
+{
+    Q_OBJECT
+    Q_PROPERTY(QString libraryID READ libraryID CONSTANT)
+    Q_PROPERTY(SymbolMaster* originalMaster READ originalMaster CONSTANT)
+    Q_PROPERTY(QString sourceLibraryName READ sourceLibraryName CONSTANT)
+    Q_PROPERTY(SymbolMaster* symbolMaster READ symbolMaster CONSTANT)
+
+public:
+    Q_INVOKABLE explicit MSImmutableForeignSymbol(QObject *parent = Q_NULLPTR);
+
+    const QString &libraryID() const;
+    SymbolMaster *originalMaster() const;
+    const QString &sourceLibraryName() const;
+    SymbolMaster *symbolMaster() const;
+
+protected:
+    // BaseContainer interface
+    virtual bool parseProperty(const QString &key, const QJsonValue &value) Q_DECL_OVERRIDE;
+
+private:
+    QString m_libraryID;
+    SymbolMaster *m_originalMaster;
+    QString m_sourceLibraryName;
+    SymbolMaster *m_symbolMaster;
+};
diff --git a/sketchlib/container/msjsonfilereference.cpp b/sketchlib/container/msjsonfilereference.cpp
new file mode 100644
index 0000000..d9ec76b
--- /dev/null
+++ b/sketchlib/container/msjsonfilereference.cpp
@@ -0,0 +1,37 @@
+#include "msjsonfilereference.h"
+
+#include <QJsonValue>
+
+MSJSONFileReference::MSJSONFileReference(QObject *parent) :
+    BaseContainer(parent)
+{
+}
+
+const QString &MSJSONFileReference::_ref() const
+{
+    return m__ref;
+}
+
+const QString &MSJSONFileReference::_ref_class() const
+{
+    return m__ref_class;
+}
+
+bool MSJSONFileReference::parseProperty(const QString &key, const QJsonValue &value)
+{
+    if(key == QStringLiteral("_ref"))
+    {
+        Q_ASSERT(value.isString());
+        m__ref = value.toString();
+        return true;
+    }
+
+    if(key == QStringLiteral("_ref_class"))
+    {
+        Q_ASSERT(value.isString());
+        m__ref_class = value.toString();
+        return true;
+    }
+
+    return BaseContainer::parseProperty(key, value);
+}
diff --git a/sketchlib/container/msjsonfilereference.h b/sketchlib/container/msjsonfilereference.h
new file mode 100644
index 0000000..a10106e
--- /dev/null
+++ b/sketchlib/container/msjsonfilereference.h
@@ -0,0 +1,27 @@
+#pragma once
+
+#include "basecontainer.h"
+#include "sketchlib_global.h"
+
+class QJsonObject;
+
+class SKETCHLIB_EXPORT MSJSONFileReference : public BaseContainer
+{
+    Q_OBJECT
+    Q_PROPERTY(QString _ref READ _ref CONSTANT)
+    Q_PROPERTY(QString _ref_class READ _ref_class CONSTANT)
+
+public:
+    Q_INVOKABLE explicit MSJSONFileReference(QObject *parent = Q_NULLPTR);
+
+    const QString &_ref() const;
+    const QString &_ref_class() const;
+
+protected:
+    // BaseContainer interface
+    virtual bool parseProperty(const QString &key, const QJsonValue &value) Q_DECL_OVERRIDE;
+
+private:
+    QString m__ref;
+    QString m__ref_class;
+};
diff --git a/sketchlib/container/oval.cpp b/sketchlib/container/oval.cpp
new file mode 100644
index 0000000..ad9b9a3
--- /dev/null
+++ b/sketchlib/container/oval.cpp
@@ -0,0 +1,11 @@
+#include "oval.h"
+
+Oval::Oval(QObject *parent) :
+    Layer(parent)
+{
+}
+
+bool Oval::parseProperty(const QString &key, const QJsonValue &value)
+{
+    return Layer::parseProperty(key, value);
+}
diff --git a/sketchlib/container/oval.h b/sketchlib/container/oval.h
new file mode 100644
index 0000000..69f5d31
--- /dev/null
+++ b/sketchlib/container/oval.h
@@ -0,0 +1,16 @@
+#pragma once
+
+#include "layer.h"
+#include "sketchlib_global.h"
+
+class SKETCHLIB_EXPORT Oval : public Layer
+{
+    Q_OBJECT
+
+public:
+    Q_INVOKABLE explicit Oval(QObject *parent = Q_NULLPTR);
+
+protected:
+    // BaseContainer interface
+    virtual bool parseProperty(const QString &key, const QJsonValue &value) Q_DECL_OVERRIDE;
+};
diff --git a/sketchlib/container/page.cpp b/sketchlib/container/page.cpp
new file mode 100644
index 0000000..4183e47
--- /dev/null
+++ b/sketchlib/container/page.cpp
@@ -0,0 +1,135 @@
+#include "page.h"
+
+#include <QJsonValue>
+#include <QJsonObject>
+
+#include "containerfactory.h"
+
+#include "rulerdata.h"
+
+Page::Page(QObject *parent) :
+    Group(parent),
+    m_layerListExpandedType(0.),
+    m_nameIsFixed(false),
+    m_resizingConstraint(0.),
+    m_resizingType(0.),
+    m_shouldBreakMaskChain(false),
+    m_hasClickThrough(false),
+    m_horizontalRulerData(Q_NULLPTR),
+    m_includeInCloudUpload(false),
+    m_verticalRulerData(Q_NULLPTR)
+{
+}
+
+double Page::layerListExpandedType() const
+{
+    return m_layerListExpandedType;
+}
+
+bool Page::nameIsFixed() const
+{
+    return m_nameIsFixed;
+}
+
+double Page::resizingConstraint() const
+{
+    return m_resizingConstraint;
+}
+
+double Page::resizingType() const
+{
+    return m_resizingType;
+}
+
+bool Page::shouldBreakMaskChain() const
+{
+    return m_shouldBreakMaskChain;
+}
+
+bool Page::hasClickThrough() const
+{
+    return m_hasClickThrough;
+}
+
+RulerData *Page::horizontalRulerData() const
+{
+    return m_horizontalRulerData;
+}
+
+bool Page::includeInCloudUpload() const
+{
+    return m_includeInCloudUpload;
+}
+
+RulerData *Page::verticalRulerData() const
+{
+    return m_verticalRulerData;
+}
+
+bool Page::parseProperty(const QString &key, const QJsonValue &value)
+{
+    if(key == QStringLiteral("layerListExpandedType"))
+    {
+        Q_ASSERT(value.isDouble());
+        m_layerListExpandedType = value.toDouble();
+        return true;
+    }
+
+    if(key == QStringLiteral("nameIsFixed"))
+    {
+        Q_ASSERT(value.isBool());
+        m_nameIsFixed = value.toBool();
+        return true;
+    }
+
+    if(key == QStringLiteral("resizingConstraint"))
+    {
+        Q_ASSERT(value.isDouble());
+        m_resizingConstraint = value.toDouble();
+        return true;
+    }
+
+    if(key == QStringLiteral("resizingType"))
+    {
+        Q_ASSERT(value.isDouble());
+        m_resizingType = value.toDouble();
+        return true;
+    }
+
+    if(key == QStringLiteral("shouldBreakMaskChain"))
+    {
+        Q_ASSERT(value.isBool());
+        m_shouldBreakMaskChain = value.toBool();
+        return true;
+    }
+
+    if(key == QStringLiteral("hasClickThrough"))
+    {
+        Q_ASSERT(value.isBool());
+        m_hasClickThrough = value.toBool();
+        return true;
+    }
+
+    if(key == QStringLiteral("horizontalRulerData"))
+    {
+        Q_ASSERT(value.isObject());
+        m_horizontalRulerData = ContainerFactory::createContainer<RulerData>(value.toObject(), this);
+        return true;
+    }
+
+    if(key == QStringLiteral("includeInCloudUpload"))
+    {
+        Q_ASSERT(value.isBool());
+        m_includeInCloudUpload = value.toBool();
+        return true;
+    }
+
+    if(key == QStringLiteral("verticalRulerData"))
+    {
+        Q_ASSERT(value.isObject());
+        m_verticalRulerData = ContainerFactory::createContainer<RulerData>(value.toObject(), this);
+        return true;
+    }
+
+    return Group::parseProperty(key, value);
+}
diff --git a/sketchlib/container/page.h b/sketchlib/container/page.h
new file mode 100644
index 0000000..d743ca2
--- /dev/null
+++ b/sketchlib/container/page.h
@@ -0,0 +1,50 @@
+#pragma once
+
+#include "group.h"
+#include "sketchlib_global.h"
+
+class QJsonObject;
+
+class RulerData;
+
+class SKETCHLIB_EXPORT Page : public Group
+{
+    Q_OBJECT
+    Q_PROPERTY(double layerListExpandedType READ layerListExpandedType CONSTANT)
+    Q_PROPERTY(bool nameIsFixed READ nameIsFixed CONSTANT)
+    Q_PROPERTY(double resizingConstraint READ resizingConstraint CONSTANT)
+    Q_PROPERTY(double resizingType READ resizingType CONSTANT)
+    Q_PROPERTY(bool shouldBreakMaskChain READ shouldBreakMaskChain CONSTANT)
+    Q_PROPERTY(bool hasClickThrough READ hasClickThrough CONSTANT)
+    Q_PROPERTY(RulerData* horizontalRulerData READ horizontalRulerData CONSTANT)
+    Q_PROPERTY(bool includeInCloudUpload READ includeInCloudUpload CONSTANT)
+    Q_PROPERTY(RulerData* verticalRulerData READ verticalRulerData CONSTANT)
+
+public:
+    Q_INVOKABLE explicit Page(QObject *parent = Q_NULLPTR);
+
+    double layerListExpandedType() const;
+    bool nameIsFixed() const;
+    double resizingConstraint() const;
+    double resizingType() const;
+    bool shouldBreakMaskChain() const;
+    bool hasClickThrough() const;
+    RulerData *horizontalRulerData() const;
+    bool includeInCloudUpload() const;
+    RulerData *verticalRulerData() const;
+
+protected:
+    // BaseContainer interface
+    virtual bool parseProperty(const QString &key, const QJsonValue &value) Q_DECL_OVERRIDE;
+
+private:
+    double m_layerListExpandedType;
+    bool m_nameIsFixed;
+    double m_resizingConstraint;
+    double m_resizingType;
+    bool m_shouldBreakMaskChain;
+    bool m_hasClickThrough;
+    RulerData *m_horizontalRulerData;
+    bool m_includeInCloudUpload;
+    RulerData *m_verticalRulerData;
+};
diff --git a/sketchlib/container/polygon.cpp b/sketchlib/container/polygon.cpp
new file mode 100644
index 0000000..d7ea24d
--- /dev/null
+++ b/sketchlib/container/polygon.cpp
@@ -0,0 +1,11 @@
+#include "polygon.h"
+
+Polygon::Polygon(QObject *parent) :
+    BaseContainer(parent)
+{
+}
+
+bool Polygon::parseProperty(const QString &key, const QJsonValue &value)
+{
+    return BaseContainer::parseProperty(key, value);
+}
diff --git a/sketchlib/container/polygon.h b/sketchlib/container/polygon.h
new file mode 100644
index 0000000..b5653bc
--- /dev/null
+++ b/sketchlib/container/polygon.h
@@ -0,0 +1,18 @@
+#pragma once
+
+#include "basecontainer.h"
+#include "sketchlib_global.h"
+
+class SKETCHLIB_EXPORT Polygon : public BaseContainer
+{
+    Q_OBJECT
+
+public:
+    Q_INVOKABLE explicit Polygon(QObject *parent = Q_NULLPTR);
+
+protected:
+    // BaseContainer interface
+    virtual bool parseProperty(const QString &key, const QJsonValue &value) Q_DECL_OVERRIDE;
+
+private:
+};
diff --git a/sketchlib/container/rect.cpp b/sketchlib/container/rect.cpp
new file mode 100644
index 0000000..55128e4
--- /dev/null
+++ b/sketchlib/container/rect.cpp
@@ -0,0 +1,78 @@
+#include "rect.h"
+
+#include <QJsonValue>
+
+Rect::Rect(QObject *parent) :
+    BaseContainer(parent),
+    m_constrainProportions(false),
+    m_height(0.),
+    m_width(0.),
+    m_x(0.),
+    m_y(0.)
+{
+}
+
+bool Rect::constrainProportions() const
+{
+    return m_constrainProportions;
+}
+
+double Rect::height() const
+{
+    return m_height;
+}
+
+double Rect::width() const
+{
+    return m_width;
+}
+
+double Rect::x() const
+{
+    return m_x;
+}
+
+double Rect::y() const
+{
+    return m_y;
+}
+
+bool Rect::parseProperty(const QString &key, const QJsonValue &value)
+{
+    if(key == QStringLiteral("constrainProportions"))
+    {
+        Q_ASSERT(value.isBool());
+        m_constrainProportions = value.toBool();
+        return true;
+    }
+
+    if(key == QStringLiteral("height"))
+    {
+        Q_ASSERT(value.isDouble());
+        m_height = value.toDouble();
+        return true;
+    }
+
+    if(key == QStringLiteral("width"))
+    {
+        Q_ASSERT(value.isDouble());
+        m_width = value.toDouble();
+        return true;
+    }
+
+    if(key == QStringLiteral("x"))
+    {
+        Q_ASSERT(value.isDouble());
+        m_x = value.toDouble();
+        return true;
+    }
+
+    if(key == QStringLiteral("y"))
+    {
+        Q_ASSERT(value.isDouble());
+        m_y = value.toDouble();
+        return true;
+    }
+
+    return BaseContainer::parseProperty(key, value);
+}
diff --git a/sketchlib/container/rect.h b/sketchlib/container/rect.h
new file mode 100644
index 0000000..b364670
--- /dev/null
+++ b/sketchlib/container/rect.h
@@ -0,0 +1,36 @@
+#pragma once
+
+#include "basecontainer.h"
+#include "sketchlib_global.h"
+
+class QJsonObject;
+
+class SKETCHLIB_EXPORT Rect : public BaseContainer
+{
+    Q_OBJECT
+    Q_PROPERTY(bool constrainProportions READ constrainProportions CONSTANT)
+    Q_PROPERTY(double height READ height CONSTANT)
+    Q_PROPERTY(double width READ width CONSTANT)
+    Q_PROPERTY(double x READ x CONSTANT)
+    Q_PROPERTY(double y READ y CONSTANT)
+
+public:
+    Q_INVOKABLE explicit Rect(QObject *parent = Q_NULLPTR);
+
+    bool constrainProportions() const;
+    double height() const;
+    double width() const;
+    double x() const;
+    double y() const;
+
+protected:
+    // BaseContainer interface
+    virtual bool parseProperty(const QString &key, const QJsonValue &value) Q_DECL_OVERRIDE;
+
+private:
+    bool m_constrainProportions;
+    double m_height;
+    double m_width;
+    double m_x;
+    double m_y;
+};
diff --git a/sketchlib/container/rectangle.cpp b/sketchlib/container/rectangle.cpp
new file mode 100644
index 0000000..aa87189
--- /dev/null
+++ b/sketchlib/container/rectangle.cpp
@@ -0,0 +1,11 @@
+#include "rectangle.h"
+
+Rectangle::Rectangle(QObject *parent) :
+    Layer(parent)
+{
+}
+
+bool Rectangle::parseProperty(const QString &key, const QJsonValue &value)
+{
+    return Layer::parseProperty(key, value);
+}
diff --git a/sketchlib/container/rectangle.h b/sketchlib/container/rectangle.h
new file mode 100644
index 0000000..4415a85
--- /dev/null
+++ b/sketchlib/container/rectangle.h
@@ -0,0 +1,16 @@
+#pragma once
+
+#include "layer.h"
+#include "sketchlib_global.h"
+
+class SKETCHLIB_EXPORT Rectangle : public Layer
+{
+    Q_OBJECT
+
+public:
+    Q_INVOKABLE explicit Rectangle(QObject *parent = Q_NULLPTR);
+
+protected:
+    // BaseContainer interface
+    virtual bool parseProperty(const QString &key, const QJsonValue &value) Q_DECL_OVERRIDE;
+};
diff --git a/sketchlib/container/rulerdata.cpp b/sketchlib/container/rulerdata.cpp
new file mode 100644
index 0000000..d6a8644
--- /dev/null
+++ b/sketchlib/container/rulerdata.cpp
@@ -0,0 +1,39 @@
+#include "rulerdata.h"
+
+#include <QDebug>
+#include <QJsonValue>
+#include <QJsonArray>
+
+RulerData::RulerData(QObject *parent) :
+    BaseContainer(parent),
+    m_base(0.)
+{
+}
+
+double RulerData::base() const
+{
+    return m_base;
+}
+
+bool RulerData::parseProperty(const QString &key, const QJsonValue &value)
+{
+    if(key == QStringLiteral("base"))
+    {
+        Q_ASSERT(value.isDouble());
+        m_base = value.toDouble();
+        return true;
+    }
+
+    if(key == QStringLiteral("guides"))
+    {
+        Q_ASSERT(value.isArray());
+        for(auto guideValue : value.toArray())
+        {
+            //TODO
+            //qWarning() << "guides not implemented";
+        }
+        return true;
+    }
+
+    return BaseContainer::parseProperty(key, value);
+}
diff --git a/sketchlib/container/rulerdata.h b/sketchlib/container/rulerdata.h
new file mode 100644
index 0000000..a22520a
--- /dev/null
+++ b/sketchlib/container/rulerdata.h
@@ -0,0 +1,24 @@
+#pragma once
+
+#include "basecontainer.h"
+#include "sketchlib_global.h"
+
+class QJsonObject;
+
+class SKETCHLIB_EXPORT RulerData : public BaseContainer
+{
+    Q_OBJECT
+    Q_PROPERTY(double base READ base CONSTANT)
+
+public:
+    Q_INVOKABLE explicit RulerData(QObject *parent = Q_NULLPTR);
+
+    double base() const;
+
+protected:
+    // BaseContainer interface
+    virtual bool parseProperty(const QString &key, const QJsonValue &value) Q_DECL_OVERRIDE;
+
+private:
+    double m_base;
+};
diff --git a/sketchlib/container/shadow.cpp b/sketchlib/container/shadow.cpp
new file mode 100644
index 0000000..0fa560d
--- /dev/null
+++ b/sketchlib/container/shadow.cpp
@@ -0,0 +1,110 @@
+#include "shadow.h"
+
+#include <QJsonValue>
+#include <QJsonObject>
+
+#include "containerfactory.h"
+
+#include "color.h"
+#include "graphicscontextsettings.h"
+
+Shadow::Shadow(QObject *parent) :
+    BaseContainer(parent),
+    m_isEnabled(false),
+    m_blurRadius(0.),
+    m_color(Q_NULLPTR),
+    m_contextSettings(Q_NULLPTR),
+    m_offsetX(0.),
+    m_offsetY(0.),
+    m_spread(0.)
+{
+}
+
+bool Shadow::isEnabled() const
+{
+    return m_isEnabled;
+}
+
+double Shadow::blurRadius() const
+{
+    return m_blurRadius;
+}
+
+Color *Shadow::color() const
+{
+    return m_color;
+}
+
+GraphicsContextSettings *Shadow::contextSettings() const
+{
+    return m_contextSettings;
+}
+
+double Shadow::offsetX() const
+{
+    return m_offsetX;
+}
+
+double Shadow::offsetY() const
+{
+    return m_offsetY;
+}
+
+double Shadow::spread() const
+{
+    return m_spread;
+}
+
+bool Shadow::parseProperty(const QString &key, const QJsonValue &value)
+{
+    if(key == QStringLiteral("isEnabled"))
+    {
+        Q_ASSERT(value.isBool());
+        m_isEnabled = value.toBool();
+        return true;
+    }
+
+    if(key == QStringLiteral("blurRadius"))
+    {
+        Q_ASSERT(value.isDouble());
+        m_blurRadius = value.toDouble();
+        return true;
+    }
+
+    if(key == QStringLiteral("color"))
+    {
+        Q_ASSERT(value.isObject());
+        m_color = ContainerFactory::createContainer<Color>(value.toObject());
+        return true;
+    }
+
+    if(key == QStringLiteral("contextSettings"))
+    {
+        Q_ASSERT(value.isObject());
+        m_contextSettings = ContainerFactory::createContainer<GraphicsContextSettings>(value.toObject());
+        return true;
+    }
+
+    if(key == QStringLiteral("offsetX"))
+    {
+        Q_ASSERT(value.isDouble());
+        m_offsetX = value.toDouble();
+        return true;
+    }
+
+    if(key == QStringLiteral("offsetY"))
+    {
+        Q_ASSERT(value.isDouble());
+        m_offsetY = value.toDouble();
+        return true;
+    }
+
+    if(key == QStringLiteral("spread"))
+    {
+        Q_ASSERT(value.isDouble());
+        m_spread = value.toDouble();
+        return true;
+    }
+
+    return BaseContainer::parseProperty(key, value);
+}
diff --git a/sketchlib/container/shadow.h b/sketchlib/container/shadow.h
new file mode 100644
index 0000000..2f8dfd0
--- /dev/null
+++ b/sketchlib/container/shadow.h
@@ -0,0 +1,43 @@
+#pragma once
+
+#include "basecontainer.h"
+#include "sketchlib_global.h"
+
+class Color;
+class GraphicsContextSettings;
+
+class SKETCHLIB_EXPORT Shadow : public BaseContainer
+{
+    Q_OBJECT
+    Q_PROPERTY(bool isEnabled READ isEnabled CONSTANT)
+    Q_PROPERTY(double blurRadius READ blurRadius CONSTANT)
+    Q_PROPERTY(Color* color READ color CONSTANT)
+    Q_PROPERTY(GraphicsContextSettings* contextSettings READ contextSettings CONSTANT)
+    Q_PROPERTY(double offsetX READ offsetX CONSTANT)
+    Q_PROPERTY(double offsetY READ offsetY CONSTANT)
+    Q_PROPERTY(double spread READ spread CONSTANT)
+
+public:
+    Q_INVOKABLE explicit Shadow(QObject *parent = Q_NULLPTR);
+
+    bool isEnabled() const;
+    double blurRadius() const;
+    Color *color() const;
+    GraphicsContextSettings *contextSettings() const;
+    double offsetX() const;
+    double offsetY() const;
+    double spread() const;
+
+protected:
+    // BaseContainer interface
+    virtual bool parseProperty(const QString &key, const QJsonValue &value) Q_DECL_OVERRIDE;
+
+private:
+    bool m_isEnabled;
+    double m_blurRadius;
+    Color *m_color;
+    GraphicsContextSettings *m_contextSettings;
+    double m_offsetX;
+    double m_offsetY;
+    double m_spread;
+};
diff --git a/sketchlib/container/shapegroup.cpp b/sketchlib/container/shapegroup.cpp
new file mode 100644
index 0000000..8045384
--- /dev/null
+++ b/sketchlib/container/shapegroup.cpp
@@ -0,0 +1,11 @@
+#include "shapegroup.h"
+
+ShapeGroup::ShapeGroup(QObject *parent) :
+    Group(parent)
+{
+}
+
+bool ShapeGroup::parseProperty(const QString &key, const QJsonValue &value)
+{
+    return Group::parseProperty(key, value);
+}
diff --git a/sketchlib/container/shapegroup.h b/sketchlib/container/shapegroup.h
new file mode 100644
index 0000000..29c72d9
--- /dev/null
+++ b/sketchlib/container/shapegroup.h
@@ -0,0 +1,20 @@
+#pragma once
+
+#include "group.h"
+#include "sketchlib_global.h"
+
+class QJsonObject;
+
+class SKETCHLIB_EXPORT ShapeGroup : public Group
+{
+    Q_OBJECT
+
+public:
+    Q_INVOKABLE explicit ShapeGroup(QObject *parent = Q_NULLPTR);
+
+protected:
+    // BaseContainer interface
+    virtual bool parseProperty(const QString &key, const QJsonValue &value) Q_DECL_OVERRIDE;
+
+private:
+};
diff --git a/sketchlib/container/shapepath.cpp b/sketchlib/container/shapepath.cpp
new file mode 100644
index 0000000..7a6550f
--- /dev/null
+++ b/sketchlib/container/shapepath.cpp
@@ -0,0 +1,11 @@
+#include "shapepath.h"
+
+ShapePath::ShapePath(QObject *parent) :
+    Layer(parent)
+{
+}
+
+bool ShapePath::parseProperty(const QString &key, const QJsonValue &value)
+{
+    return Layer::parseProperty(key, value);
+}
diff --git a/sketchlib/container/shapepath.h b/sketchlib/container/shapepath.h
new file mode 100644
index 0000000..bee909a
--- /dev/null
+++ b/sketchlib/container/shapepath.h
@@ -0,0 +1,16 @@
+#pragma once
+
+#include "layer.h"
+#include "sketchlib_global.h"
+
+class SKETCHLIB_EXPORT ShapePath : public Layer
+{
+    Q_OBJECT
+
+public:
+    Q_INVOKABLE explicit ShapePath(QObject *parent = Q_NULLPTR);
+
+protected:
+    // BaseContainer interface
+    virtual bool parseProperty(const QString &key, const QJsonValue &value) Q_DECL_OVERRIDE;
+};
diff --git a/sketchlib/container/sharedstyle.cpp b/sketchlib/container/sharedstyle.cpp
new file mode 100644
index 0000000..fe35f44
--- /dev/null
+++ b/sketchlib/container/sharedstyle.cpp
@@ -0,0 +1,42 @@
+#include "sharedstyle.h"
+
+#include <QJsonValue>
+#include <QJsonObject>
+
+#include "containerfactory.h"
+
+#include "style.h"
+
+SharedStyle::SharedStyle(QObject *parent) :
+    BaseContainer(parent)
+{
+}
+
+const QString &SharedStyle::name() const
+{
+    return m_name;
+}
+
+Style *SharedStyle::value() const
+{
+    return m_value;
+}
+
+bool SharedStyle::parseProperty(const QString &key, const QJsonValue &value)
+{
+    if(key == QStringLiteral("name"))
+    {
+        Q_ASSERT(value.isString());
+        m_name = value.toString();
+        return true;
+    }
+
+    if(key == QStringLiteral("value"))
+    {
+        Q_ASSERT(value.isObject());
+        m_value = ContainerFactory::createContainer<Style>(value.toObject(), this);
+        return true;
+    }
+
+    return BaseContainer::parseProperty(key, value);
+}
diff --git a/sketchlib/container/sharedstyle.h b/sketchlib/container/sharedstyle.h
new file mode 100644
index 0000000..53f6d8d
--- /dev/null
+++ b/sketchlib/container/sharedstyle.h
@@ -0,0 +1,29 @@
+#pragma once
+
+#include "basecontainer.h"
+#include "sketchlib_global.h"
+
+class QJsonObject;
+
+class Style;
+
+class SKETCHLIB_EXPORT SharedStyle : public BaseContainer
+{
+    Q_OBJECT
+    Q_PROPERTY(QString name READ name CONSTANT)
+    Q_PROPERTY(Style* value READ value CONSTANT)
+
+public:
+    Q_INVOKABLE explicit SharedStyle(QObject *parent = Q_NULLPTR);
+
+    const QString &name() const;
+    Style *value() const;
+
+protected:
+    // BaseContainer interface
+    virtual bool parseProperty(const QString &key, const QJsonValue &value) Q_DECL_OVERRIDE;
+
+private:
+    QString m_name;
+    Style *m_value;
+};
diff --git a/sketchlib/container/sharedstylecontainer.cpp b/sketchlib/container/sharedstylecontainer.cpp
new file mode 100644
index 0000000..22a4f98
--- /dev/null
+++ b/sketchlib/container/sharedstylecontainer.cpp
@@ -0,0 +1,35 @@
+#include "sharedstylecontainer.h"
+
+#include <QJsonValue>
+#include <QJsonObject>
+#include <QJsonArray>
+
+#include "containerfactory.h"
+
+#include "sharedstyle.h"
+
+SharedStyleContainer::SharedStyleContainer(QObject *parent) :
+    BaseContainer(parent)
+{
+}
+
+const QList<SharedStyle *> &SharedStyleContainer::objects() const
+{
+    return m_objects;
+}
+
+bool SharedStyleContainer::parseProperty(const QString &key, const QJsonValue &value)
+{
+    if(key == QStringLiteral("objects"))
+    {
+        Q_ASSERT(value.isArray());
+        for(auto objectValue : value.toArray())
+        {
+            Q_ASSERT(objectValue.isObject());
+            m_objects.append(ContainerFactory::createContainer<SharedStyle>(objectValue.toObject(), this));
+        }
+        return true;
+    }
+
+    return BaseContainer::parseProperty(key, value);
+}
diff --git a/sketchlib/container/sharedstylecontainer.h b/sketchlib/container/sharedstylecontainer.h
new file mode 100644
index 0000000..16dd3d7
--- /dev/null
+++ b/sketchlib/container/sharedstylecontainer.h
@@ -0,0 +1,26 @@
+#pragma once
+
+#include "basecontainer.h"
+#include "sketchlib_global.h"
+
+class QJsonObject;
+
+class SharedStyle;
+
+class SKETCHLIB_EXPORT SharedStyleContainer : public BaseContainer
+{
+    Q_OBJECT
+    Q_PROPERTY(QList<SharedStyle*> objects READ objects CONSTANT)
+
+public:
+    Q_INVOKABLE explicit SharedStyleContainer(QObject *parent = Q_NULLPTR);
+
+    const QList<SharedStyle*> &objects() const;
+
+protected:
+    // BaseContainer interface
+    virtual bool parseProperty(const QString &key, const QJsonValue &value) Q_DECL_OVERRIDE;
+
+private:
+    QList<SharedStyle*> m_objects;
+};
diff --git a/sketchlib/container/sharedtextstylecontainer.cpp b/sketchlib/container/sharedtextstylecontainer.cpp
new file mode 100644
index 0000000..b15ecc8
--- /dev/null
+++ b/sketchlib/container/sharedtextstylecontainer.cpp
@@ -0,0 +1,34 @@
+#include "sharedtextstylecontainer.h"
+
+#include <QJsonValue>
+#include <QJsonObject>
+#include <QJsonArray>
+
+#include "containerfactory.h"
+
+#include "sharedstyle.h"
+
+SharedTextStyleContainer::SharedTextStyleContainer(QObject *parent) :
+    BaseContainer(parent)
+{
+}
+
+const QList<SharedStyle *> &SharedTextStyleContainer::objects() const
+{
+    return m_objects;
+}
+
+bool SharedTextStyleContainer::parseProperty(const QString &key, const QJsonValue &value)
+{
+    if(key == QStringLiteral("objects"))
+    {
+        Q_ASSERT(value.isArray());
+        for(auto objectValue : value.toArray())
+        {
+            Q_ASSERT(objectValue.isObject());
+            m_objects.append(ContainerFactory::createContainer<SharedStyle>(objectValue.toObject(), this));
+        }
+    }
+
+    return BaseContainer::parseProperty(key, value);
+}
diff --git a/sketchlib/container/sharedtextstylecontainer.h b/sketchlib/container/sharedtextstylecontainer.h
new file mode 100644
index 0000000..0fc639f
--- /dev/null
+++ b/sketchlib/container/sharedtextstylecontainer.h
@@ -0,0 +1,26 @@
+#pragma once
+
+#include "basecontainer.h"
+#include "sketchlib_global.h"
+
+class QJsonObject;
+
+class SharedStyle;
+
+class SKETCHLIB_EXPORT SharedTextStyleContainer : public BaseContainer
+{
+    Q_OBJECT
+    Q_PROPERTY(QList<SharedStyle*> objects READ objects CONSTANT)
+
+public:
+    Q_INVOKABLE explicit SharedTextStyleContainer(QObject *parent = Q_NULLPTR);
+
+    const QList<SharedStyle*> &objects() const;
+
+protected:
+    // BaseContainer interface
+    virtual bool parseProperty(const QString &key, const QJsonValue &value) Q_DECL_OVERRIDE;
+
+private:
+    QList<SharedStyle*> m_objects;
+};
diff --git a/sketchlib/container/slice.cpp b/sketchlib/container/slice.cpp
new file mode 100644
index 0000000..7357db6
--- /dev/null
+++ b/sketchlib/container/slice.cpp
@@ -0,0 +1,44 @@
+#include "slice.h"
+
+#include <QJsonValue>
+#include <QJsonObject>
+
+#include "containerfactory.h"
+
+#include "color.h"
+
+Slice::Slice(QObject *parent) :
+    Layer(parent),
+    m_backgroundColor(Q_NULLPTR),
+    m_hasBackgroundColor(false)
+{
+}
+
+Color *Slice::backgroundColor() const
+{
+    return m_backgroundColor;
+}
+
+bool Slice::hasBackgroundColor() const
+{
+    return m_hasBackgroundColor;
+}
+
+bool Slice::parseProperty(const QString &key, const QJsonValue &value)
+{
+    if(key == QStringLiteral("backgroundColor"))
+    {
+        Q_ASSERT(value.isObject());
+        m_backgroundColor = ContainerFactory::createContainer<Color>(value.toObject());
+        return true;
+    }
+
+    if(key == QStringLiteral("hasBackgroundColor"))
+    {
+        Q_ASSERT(value.isBool());
+        m_hasBackgroundColor = value.toBool();
+        return true;
+    }
+
+    return Layer::parseProperty(key, value);
+}
diff --git a/sketchlib/container/slice.h b/sketchlib/container/slice.h
new file mode 100644
index 0000000..6c0abc3
--- /dev/null
+++ b/sketchlib/container/slice.h
@@ -0,0 +1,25 @@
+#pragma once
+
+#include "layer.h"
+#include "sketchlib_global.h"
+
+class Color;
+
+class SKETCHLIB_EXPORT Slice : public Layer
+{
+    Q_OBJECT
+
+public:
+    Q_INVOKABLE explicit Slice(QObject *parent = Q_NULLPTR);
+
+    Color *backgroundColor() const;
+    bool hasBackgroundColor() const;
+
+protected:
+    // BaseContainer interface
+    virtual bool parseProperty(const QString &key, const QJsonValue &value) Q_DECL_OVERRIDE;
+
+private:
+    Color *m_backgroundColor;
+    bool m_hasBackgroundColor;
+};
diff --git a/sketchlib/container/style.cpp b/sketchlib/container/style.cpp
new file mode 100644
index 0000000..07e4a86
--- /dev/null
+++ b/sketchlib/container/style.cpp
@@ -0,0 +1,169 @@
+#include "style.h"
+
+#include <QJsonValue>
+#include <QJsonObject>
+#include <QJsonArray>
+
+#include "containerfactory.h"
+
+#include "blur.h"
+#include "borderoptions.h"
+#include "border.h"
+#include "fill.h"
+#include "graphicscontextsettings.h"
+#include "textstyle.h"
+
+Style::Style(QObject *parent) :
+    BaseContainer(parent),
+    m_blur(Q_NULLPTR),
+    m_borderOptions(Q_NULLPTR),
+    m_miterLimit(0.),
+    m_startDecorationType(0.),
+    m_textStyle(Q_NULLPTR)
+{
+}
+
+const QString &Style::name() const
+{
+    return m_name;
+}
+
+Blur *Style::blur() const
+{
+    return m_blur;
+}
+
+BorderOptions *Style::borderOptions() const
+{
+    return m_borderOptions;
+}
+
+const QList<Border *> &Style::borders() const
+{
+    return m_borders;
+}
+
+const QList<Fill *> &Style::fills() const
+{
+    return m_fills;
+}
+
+GraphicsContextSettings *Style::contextSettings() const
+{
+    return m_contextSettings;
+}
+
+double Style::endDecorationType() const
+{
+    return m_endDecorationType;
+}
+
+double Style::miterLimit() const
+{
+    return m_miterLimit;
+}
+
+const QString &Style::sharedObjectID() const
+{
+    return m_sharedObjectID;
+}
+
+double Style::startDecorationType() const
+{
+    return m_startDecorationType;
+}
+
+TextStyle *Style::textStyle() const
+{
+    return m_textStyle;
+}
+
+bool Style::parseProperty(const QString &key, const QJsonValue &value)
+{
+    if(key == QStringLiteral("name"))
+    {
+        Q_ASSERT(value.isString());
+        m_name = value.toString();
+        return true;
+    }
+
+    if(key == QStringLiteral("blur"))
+    {
+        Q_ASSERT(value.isObject());
+        m_blur = ContainerFactory::createContainer<Blur>(value.toObject(), this);
+        return true;
+    }
+
+    if(key == QStringLiteral("borderOptions"))
+    {
+        Q_ASSERT(value.isObject());
+        m_borderOptions = ContainerFactory::createContainer<BorderOptions>(value.toObject(), this);
+        return true;
+    }
+
+    if(key == QStringLiteral("borders"))
+    {
+        Q_ASSERT(value.isArray());
+        for(auto fillValue : value.toArray())
+        {
+            Q_ASSERT(fillValue.isObject());
+            m_borders.append(ContainerFactory::createContainer<Border>(fillValue.toObject(), this));
+        }
+        return true;
+    }
+
+    if(key == QStringLiteral("fills"))
+    {
+        Q_ASSERT(value.isArray());
+        for(auto fillValue : value.toArray())
+        {
+            Q_ASSERT(fillValue.isObject());
+            m_fills.append(ContainerFactory::createContainer<Fill>(fillValue.toObject(), this));
+        }
+        return true;
+    }
+
+    if(key == QStringLiteral("contextSettings"))
+    {
+        Q_ASSERT(value.isObject());
+        m_contextSettings = ContainerFactory::createContainer<GraphicsContextSettings>(value.toObject(), this);
+        return true;
+    }
+
+    if(key == QStringLiteral("endDecorationType"))
+    {
+        Q_ASSERT(value.isDouble());
+        m_endDecorationType = value.toDouble();
+        return true;
+    }
+
+    if(key == QStringLiteral("miterLimit"))
+    {
+        Q_ASSERT(value.isDouble());
+        m_miterLimit = value.toDouble();
+        return true;
+    }
+
+    if(key == QStringLiteral("sharedObjectID"))
+    {
+        Q_ASSERT(value.isString());
+        m_sharedObjectID = value.toString();
+        return true;
+    }
+
+    if(key == QStringLiteral("startDecorationType"))
+    {
+        Q_ASSERT(value.isDouble());
+        m_startDecorationType = value.toDouble();
+        return true;
+    }
+
+    if(key == QStringLiteral("textStyle"))
+    {
+        Q_ASSERT(value.isObject());
+        m_textStyle = ContainerFactory::createContainer<TextStyle>(value.toObject(), this);
+        return true;
+    }
+
+    return BaseContainer::parseProperty(key, value);
+}
diff --git a/sketchlib/container/style.h b/sketchlib/container/style.h
new file mode 100644
index 0000000..8e4767e
--- /dev/null
+++ b/sketchlib/container/style.h
@@ -0,0 +1,61 @@
+#pragma once
+
+#include "basecontainer.h"
+#include "sketchlib_global.h"
+
+class QJsonObject;
+
+class Blur;
+class BorderOptions;
+class Border;
+class Fill;
+class GraphicsContextSettings;
+class TextStyle;
+
+class SKETCHLIB_EXPORT Style : public BaseContainer
+{
+    Q_OBJECT
+    Q_PROPERTY(QString name READ name CONSTANT)
+    Q_PROPERTY(Blur* blur READ blur CONSTANT)
+    Q_PROPERTY(BorderOptions* borderOptions READ borderOptions CONSTANT)
+    Q_PROPERTY(QList<Border*> borders READ borders CONSTANT)
+    Q_PROPERTY(QList<Fill*> fills READ fills CONSTANT)
+    Q_PROPERTY(GraphicsContextSettings* contextSettings READ contextSettings CONSTANT)
+    Q_PROPERTY(double endDecorationType READ endDecorationType CONSTANT)
+    Q_PROPERTY(double miterLimit READ miterLimit CONSTANT)
+    Q_PROPERTY(QString sharedObjectID READ sharedObjectID CONSTANT)
+    Q_PROPERTY(double startDecorationType READ startDecorationType CONSTANT)
+    Q_PROPERTY(TextStyle* textStyle READ textStyle CONSTANT)
+
+public:
+    Q_INVOKABLE explicit Style(QObject *parent = Q_NULLPTR);
+
+    const QString &name() const;
+    Blur *blur() const;
+    BorderOptions *borderOptions() const;
+    const QList<Border*> &borders() const;
+    const QList<Fill*> &fills() const;
+    GraphicsContextSettings *contextSettings() const;
+    double endDecorationType() const;
+    double miterLimit() const;
+    const QString &sharedObjectID() const;
+    double startDecorationType() const;
+    TextStyle *textStyle() const;
+
+protected:
+    // BaseContainer interface
+    virtual bool parseProperty(const QString &key, const QJsonValue &value) Q_DECL_OVERRIDE;
+
+private:
+    QString m_name;
+    Blur *m_blur;
+    BorderOptions *m_borderOptions;
+    QList<Border*> m_borders;
+    QList<Fill*> m_fills;
+    GraphicsContextSettings *m_contextSettings;
+    double m_endDecorationType;
+    double m_miterLimit;
+    QString m_sharedObjectID;
+    double m_startDecorationType;
+    TextStyle *m_textStyle;
+};
diff --git a/sketchlib/container/symbolcontainer.cpp b/sketchlib/container/symbolcontainer.cpp
new file mode 100644
index 0000000..fceb86e
--- /dev/null
+++ b/sketchlib/container/symbolcontainer.cpp
@@ -0,0 +1,26 @@
+#include "symbolcontainer.h"
+
+#include <QDebug>
+#include <QJsonValue>
+#include <QJsonArray>
+
+SymbolContainer::SymbolContainer(QObject *parent) :
+    BaseContainer(parent)
+{
+}
+
+bool SymbolContainer::parseProperty(const QString &key, const QJsonValue &value)
+{
+    if(key == QStringLiteral("objects"))
+    {
+        Q_ASSERT(value.isArray());
+        for(auto objectValue : value.toArray())
+        {
+            //TODO
+            //qWarning() << "objects not implemented";
+        }
+        return true;
+    }
+
+    return BaseContainer::parseProperty(key, value);
+}
diff --git a/sketchlib/container/symbolcontainer.h b/sketchlib/container/symbolcontainer.h
new file mode 100644
index 0000000..105945c
--- /dev/null
+++ b/sketchlib/container/symbolcontainer.h
@@ -0,0 +1,24 @@
+#pragma once
+
+#include "basecontainer.h"
+#include "sketchlib_global.h"
+
+class QJsonObject;
+
+class SKETCHLIB_EXPORT SymbolContainer : public BaseContainer
+{
+    Q_OBJECT
+    //TODO objects
+
+public:
+    Q_INVOKABLE explicit SymbolContainer(QObject *parent = Q_NULLPTR);
+
+    //TODO objects
+
+protected:
+    // BaseContainer interface
+    virtual bool parseProperty(const QString &key, const QJsonValue &value) Q_DECL_OVERRIDE;
+
+private:
+    //TODO objects
+};
diff --git a/sketchlib/container/symbolinstance.cpp b/sketchlib/container/symbolinstance.cpp
new file mode 100644
index 0000000..4fdf15d
--- /dev/null
+++ b/sketchlib/container/symbolinstance.cpp
@@ -0,0 +1,202 @@
+#include "symbolinstance.h"
+
+#include <QDebug>
+#include <QJsonValue>
+#include <QJsonObject>
+#include <QJsonArray>
+
+SymbolInstance::SymbolInstance(QObject *parent) :
+    Layer(parent),
+    m_nameIsFixed(false),
+    m_resizingConstraint(0.),
+    m_resizingType(0.),
+    m_scale(0.),
+    m_shouldBreakMaskChain(false),
+    m_verticalSpacing(0.),
+    m_horizontalSpacing(0.),
+    m_layerListExpandedType(0.),
+    m_masterInfluenceEdgeMaxXPadding(0.),
+    m_masterInfluenceEdgeMaxYPadding(0.),
+    m_masterInfluenceEdgeMinXPadding(0.),
+    m_masterInfluenceEdgeMinYPadding(0.)
+{
+}
+
+bool SymbolInstance::nameIsFixed() const
+{
+    return m_nameIsFixed;
+}
+
+double SymbolInstance::resizingConstraint() const
+{
+    return m_resizingConstraint;
+}
+
+double SymbolInstance::resizingType() const
+{
+    return m_resizingType;
+}
+
+double SymbolInstance::scale() const
+{
+    return m_scale;
+}
+
+bool SymbolInstance::shouldBreakMaskChain() const
+{
+    return m_shouldBreakMaskChain;
+}
+
+const QString &SymbolInstance::symbolID() const
+{
+    return m_symbolID;
+}
+
+double SymbolInstance::verticalSpacing() const
+{
+    return m_verticalSpacing;
+}
+
+double SymbolInstance::horizontalSpacing() const
+{
+    return m_horizontalSpacing;
+}
+
+double SymbolInstance::layerListExpandedType() const
+{
+    return m_layerListExpandedType;
+}
+
+double SymbolInstance::masterInfluenceEdgeMaxXPadding() const
+{
+    return m_masterInfluenceEdgeMaxXPadding;
+}
+
+double SymbolInstance::masterInfluenceEdgeMaxYPadding() const
+{
+    return m_masterInfluenceEdgeMaxYPadding;
+}
+
+double SymbolInstance::masterInfluenceEdgeMinXPadding() const
+{
+    return m_masterInfluenceEdgeMinXPadding;
+}
+
+double SymbolInstance::masterInfluenceEdgeMinYPadding() const
+{
+    return m_masterInfluenceEdgeMinYPadding;
+}
+
+bool SymbolInstance::parseProperty(const QString &key, const QJsonValue &value)
+{
+    if(key == QStringLiteral("nameIsFixed"))
+    {
+        Q_ASSERT(value.isBool());
+        m_nameIsFixed = value.toBool();
+        return true;
+    }
+
+    if(key == QStringLiteral("overrideValues"))
+    {
+        Q_ASSERT(value.isArray());
+        for(auto overrideValue : value.toArray())
+        {
+            Q_ASSERT(overrideValue.isObject());
+            //qWarning() << "overrideValues not implemented";
+        }
+        return true;
+    }
+
+    if(key == QStringLiteral("overrides"))
+    {
+        Q_ASSERT(value.isObject());
+        //qWarning() << "overrides not implemented";
+        return true;
+    }
+
+    if(key == QStringLiteral("resizingConstraint"))
+    {
+        Q_ASSERT(value.isDouble());
+        m_resizingConstraint = value.toDouble();
+        return true;
+    }
+
+    if(key == QStringLiteral("resizingType"))
+    {
+        Q_ASSERT(value.isDouble());
+        m_resizingType = value.toDouble();
+        return true;
+    }
+
+    if(key == QStringLiteral("scale"))
+    {
+        Q_ASSERT(value.isDouble());
+        m_scale = value.toDouble();
+        return true;
+    }
+
+    if(key == QStringLiteral("shouldBreakMaskChain"))
+    {
+        Q_ASSERT(value.isBool());
+        m_shouldBreakMaskChain = value.toBool();
+        return true;
+    }
+
+    if(key == QStringLiteral("symbolID"))
+    {
+        Q_ASSERT(value.isString());
+        m_symbolID = value.toString();
+        return true;
+    }
+
+    if(key == QStringLiteral("verticalSpacing"))
+    {
+        Q_ASSERT(value.isDouble());
+        m_verticalSpacing = value.toDouble();
+        return true;
+    }
+
+    if(key == QStringLiteral("horizontalSpacing"))
+    {
+        Q_ASSERT(value.isDouble());
+        m_horizontalSpacing = value.toDouble();
+        return true;
+    }
+
+    if(key == QStringLiteral("layerListExpandedType"))
+    {
+        Q_ASSERT(value.isDouble());
+        m_layerListExpandedType = value.toDouble();
+        return true;
+    }
+
+    if(key == QStringLiteral("masterInfluenceEdgeMaxXPadding"))
+    {
+        Q_ASSERT(value.isDouble());
+        m_masterInfluenceEdgeMaxXPadding = value.toDouble();
+        return true;
+    }
+
+    if(key == QStringLiteral("masterInfluenceEdgeMaxYPadding"))
+    {
+        Q_ASSERT(value.isDouble());
+        m_masterInfluenceEdgeMaxYPadding = value.toDouble();
+        return true;
+    }
+
+    if(key == QStringLiteral("masterInfluenceEdgeMinXPadding"))
+    {
+        Q_ASSERT(value.isDouble());
+        m_masterInfluenceEdgeMinXPadding = value.toDouble();
+        return true;
+    }
+
+    if(key == QStringLiteral("masterInfluenceEdgeMinYPadding"))
+    {
+        Q_ASSERT(value.isDouble());
+        m_masterInfluenceEdgeMinYPadding = value.toDouble();
+        return true;
+    }
+
+    return Layer::parseProperty(key, value);
+}
diff --git a/sketchlib/container/symbolinstance.h b/sketchlib/container/symbolinstance.h
new file mode 100644
index 0000000..402ca25
--- /dev/null
+++ b/sketchlib/container/symbolinstance.h
@@ -0,0 +1,66 @@
+#pragma once
+
+#include "layer.h"
+#include "sketchlib_global.h"
+
+class QJsonObject;
+
+class SKETCHLIB_EXPORT SymbolInstance : public Layer
+{
+    Q_OBJECT
+    Q_PROPERTY(bool nameIsFixed READ nameIsFixed CONSTANT)
+    //TODO overrideValues
+    //TODO overrides
+    Q_PROPERTY(double resizingConstraint READ resizingConstraint CONSTANT)
+    Q_PROPERTY(double resizingType READ resizingType CONSTANT)
+    Q_PROPERTY(double scale READ scale CONSTANT)
+    Q_PROPERTY(bool shouldBreakMaskChain READ shouldBreakMaskChain CONSTANT)
+    Q_PROPERTY(QString symbolID READ symbolID CONSTANT)
+    Q_PROPERTY(double verticalSpacing READ verticalSpacing CONSTANT)
+    Q_PROPERTY(double horizontalSpacing READ horizontalSpacing CONSTANT)
+    Q_PROPERTY(double layerListExpandedType READ layerListExpandedType CONSTANT)
+    Q_PROPERTY(double masterInfluenceEdgeMaxXPadding READ masterInfluenceEdgeMaxXPadding CONSTANT)
+    Q_PROPERTY(double masterInfluenceEdgeMaxYPadding READ masterInfluenceEdgeMaxYPadding CONSTANT)
+    Q_PROPERTY(double masterInfluenceEdgeMinXPadding READ masterInfluenceEdgeMinXPadding CONSTANT)
+    Q_PROPERTY(double masterInfluenceEdgeMinYPadding READ masterInfluenceEdgeMinYPadding CONSTANT)
+
+public:
+    Q_INVOKABLE explicit SymbolInstance(QObject *parent = Q_NULLPTR);
+
+    bool nameIsFixed() const;
+    //TODO overrideValues
+    //TODO overrides
+    double resizingConstraint() const;
+    double resizingType() const;
+    double scale() const;
+    bool shouldBreakMaskChain() const;
+    const QString &symbolID() const;
+    double verticalSpacing() const;
+    double horizontalSpacing() const;
+    double layerListExpandedType() const;
+    double masterInfluenceEdgeMaxXPadding() const;
+    double masterInfluenceEdgeMaxYPadding() const;
+    double masterInfluenceEdgeMinXPadding() const;
+    double masterInfluenceEdgeMinYPadding() const;
+
+protected:
+    // BaseContainer interface
+    virtual bool parseProperty(const QString &key, const QJsonValue &value) Q_DECL_OVERRIDE;
+
+private:
+    bool m_nameIsFixed;
+    //TODO m_overrideValues;
+    //TODO m_overrides;
+    double m_resizingConstraint;
+    double m_resizingType;
+    double m_scale;
+    bool m_shouldBreakMaskChain;
+    QString m_symbolID;
+    double m_verticalSpacing;
+    double m_horizontalSpacing;
+    double m_layerListExpandedType;
+    double m_masterInfluenceEdgeMaxXPadding;
+    double m_masterInfluenceEdgeMaxYPadding;
+    double m_masterInfluenceEdgeMinXPadding;
+    double m_masterInfluenceEdgeMinYPadding;
+};
diff --git a/sketchlib/container/symbolmaster.cpp b/sketchlib/container/symbolmaster.cpp
new file mode 100644
index 0000000..40a9415
--- /dev/null
+++ b/sketchlib/container/symbolmaster.cpp
@@ -0,0 +1,240 @@
+#include "symbolmaster.h"
+
+#include <QJsonValue>
+#include <QJsonObject>
+#include <QJsonArray>
+
+#include "containerfactory.h"
+
+#include "color.h"
+#include "rulerdata.h"
+
+SymbolMaster::SymbolMaster(QObject *parent) :
+    Artboard(parent),
+    m_backgroundColor(Q_NULLPTR),
+    m_changeIdentifier(0.),
+    m_hasBackgroundColor(false),
+    m_hasClickThrough(false),
+    m_horizontalRulerData(Q_NULLPTR),
+    m_includeBackgroundColorInExport(false),
+    m_includeBackgroundColorInInstance(false),
+    m_includeInCloudUpload(false),
+    m_isFlowHome(false),
+    m_layerListExpandedType(0.),
+    m_nameIsFixed(false),
+    m_resizesContent(false),
+    m_resizingConstraint(0.),
+    m_resizingType(0.),
+    m_shouldBreakMaskChain(false),
+    m_verticalRulerData(Q_NULLPTR)
+{
+}
+
+Color *SymbolMaster::backgroundColor() const
+{
+    return m_backgroundColor;
+}
+
+double SymbolMaster::changeIdentifier() const
+{
+    return m_changeIdentifier;
+}
+
+bool SymbolMaster::hasBackgroundColor() const
+{
+    return m_hasBackgroundColor;
+}
+
+bool SymbolMaster::hasClickThrough() const
+{
+    return m_hasClickThrough;
+}
+
+RulerData *SymbolMaster::horizontalRulerData() const
+{
+    return m_horizontalRulerData;
+}
+
+bool SymbolMaster::includeBackgroundColorInExport() const
+{
+    return m_includeBackgroundColorInExport;
+}
+
+bool SymbolMaster::includeBackgroundColorInInstance() const
+{
+    return m_includeBackgroundColorInInstance;
+}
+
+bool SymbolMaster::includeInCloudUpload() const
+{
+    return m_includeInCloudUpload;
+}
+
+bool SymbolMaster::isFlowHome() const
+{
+    return m_isFlowHome;
+}
+
+double SymbolMaster::layerListExpandedType() const
+{
+    return m_layerListExpandedType;
+}
+
+bool SymbolMaster::nameIsFixed() const
+{
+    return m_nameIsFixed;
+}
+
+bool SymbolMaster::resizesContent() const
+{
+    return m_resizesContent;
+}
+
+double SymbolMaster::resizingConstraint() const
+{
+    return m_resizingConstraint;
+}
+
+double SymbolMaster::resizingType() const
+{
+    return m_resizingType;
+}
+
+bool SymbolMaster::shouldBreakMaskChain() const
+{
+    return m_shouldBreakMaskChain;
+}
+
+const QString &SymbolMaster::symbolID() const
+{
+    return m_symbolID;
+}
+
+RulerData *SymbolMaster::verticalRulerData() const
+{
+    return m_verticalRulerData;
+}
+
+bool SymbolMaster::parseProperty(const QString &key, const QJsonValue &value)
+{
+    if(key == QStringLiteral("backgroundColor"))
+    {
+        Q_ASSERT(value.isObject());
+        m_backgroundColor = ContainerFactory::createContainer<Color>(value.toObject(), this);
+        return true;
+    }
+
+    if(key == QStringLiteral("changeIdentifier"))
+    {
+        Q_ASSERT(value.isDouble());
+        m_changeIdentifier = value.toDouble();
+        return true;
+    }
+
+    if(key == QStringLiteral("hasBackgroundColor"))
+    {
+        Q_ASSERT(value.isBool());
+        m_hasBackgroundColor = value.toBool();
+        return true;
+    }
+
+    if(key == QStringLiteral("hasClickThrough"))
+    {
+        Q_ASSERT(value.isBool());
+        m_hasClickThrough = value.toBool();
+        return true;
+    }
+
+    if(key == QStringLiteral("horizontalRulerData"))
+    {
+        Q_ASSERT(value.isObject());
+        m_horizontalRulerData = ContainerFactory::createContainer<RulerData>(value.toObject(), this);
+        return true;
+    }
+
+    if(key == QStringLiteral("includeBackgroundColorInExport"))
+    {
+        Q_ASSERT(value.isBool());
+        m_includeBackgroundColorInExport = value.toBool();
+        return true;
+    }
+
+    if(key == QStringLiteral("includeBackgroundColorInInstance"))
+    {
+        Q_ASSERT(value.isBool());
+        m_includeBackgroundColorInInstance = value.toBool();
+        return true;
+    }
+
+    if(key == QStringLiteral("includeInCloudUpload"))
+    {
+        Q_ASSERT(value.isBool());
+        m_includeInCloudUpload = value.toBool();
+        return true;
+    }
+
+    if(key == QStringLiteral("isFlowHome"))
+    {
+        Q_ASSERT(value.isBool());
+        m_isFlowHome = value.toBool();
+        return true;
+    }
+
+    if(key == QStringLiteral("layerListExpandedType"))
+    {
+        Q_ASSERT(value.isDouble());
+        m_layerListExpandedType = value.toDouble();
+        return true;
+    }
+
+    if(key == QStringLiteral("nameIsFixed"))
+    {
+        Q_ASSERT(value.isBool());
+        m_nameIsFixed = value.toBool();
+        return true;
+    }
+
+    if(key == QStringLiteral("resizesContent"))
+    {
+        Q_ASSERT(value.isBool());
+        m_resizesContent = value.toBool();
+        return true;
+    }
+
+    if(key == QStringLiteral("resizingConstraint"))
+    {
+        Q_ASSERT(value.isDouble());
+        m_resizingConstraint = value.toDouble();
+        return true;
+    }
+
+    if(key == QStringLiteral("resizingType"))
+    {
+        Q_ASSERT(value.isDouble());
+        m_resizingType = value.toDouble();
+        return true;
+    }
+
+    if(key == QStringLiteral("shouldBreakMaskChain"))
+    {
+        Q_ASSERT(value.isBool());
+        m_shouldBreakMaskChain = value.toBool();
+        return true;
+    }
+
+    if(key == QStringLiteral("symbolID"))
+    {
+        Q_ASSERT(value.isString());
+        m_symbolID = value.toString();
+        return true;
+    }
+
+    if(key == QStringLiteral("verticalRulerData"))
+    {
+        Q_ASSERT(value.isObject());
+        m_verticalRulerData = ContainerFactory::createContainer<RulerData>(value.toObject(), this);
+        return true;
+    }
+
+    return Artboard::parseProperty(key, value);
+}
diff --git a/sketchlib/container/symbolmaster.h b/sketchlib/container/symbolmaster.h
new file mode 100644
index 0000000..35789df
--- /dev/null
+++ b/sketchlib/container/symbolmaster.h
@@ -0,0 +1,75 @@
+#pragma once
+
+#include "artboard.h"
+#include "sketchlib_global.h"
+
+class QJsonObject;
+
+class Color;
+class RulerData;
+
+class SKETCHLIB_EXPORT SymbolMaster : public Artboard
+{
+    Q_OBJECT
+    Q_PROPERTY(Color* backgroundColor READ backgroundColor CONSTANT)
+    Q_PROPERTY(double changeIdentifier READ changeIdentifier CONSTANT)
+    Q_PROPERTY(bool hasBackgroundColor READ hasBackgroundColor CONSTANT)
+    Q_PROPERTY(bool hasClickThrough READ hasClickThrough CONSTANT)
+    Q_PROPERTY(RulerData* horizontalRulerData READ horizontalRulerData CONSTANT)
+    Q_PROPERTY(bool includeBackgroundColorInExport READ includeBackgroundColorInExport CONSTANT)
+    Q_PROPERTY(bool includeBackgroundColorInInstance READ includeBackgroundColorInInstance CONSTANT)
+    Q_PROPERTY(bool includeInCloudUpload READ includeInCloudUpload CONSTANT)
+    Q_PROPERTY(bool isFlowHome READ isFlowHome CONSTANT)
+    Q_PROPERTY(double layerListExpandedType READ layerListExpandedType CONSTANT)
+    Q_PROPERTY(bool nameIsFixed READ nameIsFixed CONSTANT)
+    Q_PROPERTY(bool resizesContent READ resizesContent CONSTANT)
+    Q_PROPERTY(double resizingConstraint READ resizingConstraint CONSTANT)
+    Q_PROPERTY(double resizingType READ resizingType CONSTANT)
+    Q_PROPERTY(bool shouldBreakMaskChain READ shouldBreakMaskChain CONSTANT)
+    Q_PROPERTY(QString symbolID READ symbolID CONSTANT)
+    Q_PROPERTY(RulerData* verticalRulerData READ verticalRulerData CONSTANT)
+
+public:
+    Q_INVOKABLE explicit SymbolMaster(QObject *parent = Q_NULLPTR);
+
+    Color *backgroundColor() const;
+    double changeIdentifier() const;
+    bool hasBackgroundColor() const;
+    bool hasClickThrough() const;
+    RulerData *horizontalRulerData() const;
+    bool includeBackgroundColorInExport() const;
+    bool includeBackgroundColorInInstance() const;
+    bool includeInCloudUpload() const;
+    bool isFlowHome() const;
+    double layerListExpandedType() const;
+    bool nameIsFixed() const;
+    bool resizesContent() const;
+    double resizingConstraint() const;
+    double resizingType() const;
+    bool shouldBreakMaskChain() const;
+    const QString &symbolID() const;
+    RulerData *verticalRulerData() const;
+
+protected:
+    // BaseContainer interface
+    virtual bool parseProperty(const QString &key, const QJsonValue &value) Q_DECL_OVERRIDE;
+
+private:
+    Color *m_backgroundColor;
+    double m_changeIdentifier;
+    bool m_hasBackgroundColor;
+    bool m_hasClickThrough;
+    RulerData *m_horizontalRulerData;
+    bool m_includeBackgroundColorInExport;
+    bool m_includeBackgroundColorInInstance;
+    bool m_includeInCloudUpload;
+    bool m_isFlowHome;
+    double m_layerListExpandedType;
+    bool m_nameIsFixed;
+    bool m_resizesContent;
+    double m_resizingConstraint;
+    double m_resizingType;
+    bool m_shouldBreakMaskChain;
+    QString m_symbolID;
+    RulerData *m_verticalRulerData;
+};
diff --git a/sketchlib/container/text.cpp b/sketchlib/container/text.cpp
new file mode 100644
index 0000000..7d9485b
--- /dev/null
+++ b/sketchlib/container/text.cpp
@@ -0,0 +1,11 @@
+#include "text.h"
+
+Text::Text(QObject *parent) :
+    Layer(parent)
+{
+}
+
+bool Text::parseProperty(const QString &key, const QJsonValue &value)
+{
+    return Layer::parseProperty(key, value);
+}
diff --git a/sketchlib/container/text.h b/sketchlib/container/text.h
new file mode 100644
index 0000000..941d8e5
--- /dev/null
+++ b/sketchlib/container/text.h
@@ -0,0 +1,20 @@
+#pragma once
+
+#include "layer.h"
+#include "sketchlib_global.h"
+
+class QJsonObject;
+
+class SKETCHLIB_EXPORT Text : public Layer
+{
+    Q_OBJECT
+
+public:
+    Q_INVOKABLE explicit Text(QObject *parent = Q_NULLPTR);
+
+protected:
+    // BaseContainer interface
+    virtual bool parseProperty(const QString &key, const QJsonValue &value) Q_DECL_OVERRIDE;
+
+private:
+};
diff --git a/sketchlib/container/textstyle.cpp b/sketchlib/container/textstyle.cpp
new file mode 100644
index 0000000..27a3972
--- /dev/null
+++ b/sketchlib/container/textstyle.cpp
@@ -0,0 +1,33 @@
+#include "textstyle.h"
+
+#include <QDebug>
+#include <QJsonValue>
+
+TextStyle::TextStyle(QObject *parent) :
+    BaseContainer(parent),
+    m_verticalAlignment(0.)
+{
+}
+
+double TextStyle::verticalAlignment() const
+{
+    return m_verticalAlignment;
+}
+
+bool TextStyle::parseProperty(const QString &key, const QJsonValue &value)
+{
+    if(key == QStringLiteral("verticalAlignment"))
+    {
+        Q_ASSERT(value.isDouble());
+        m_verticalAlignment = value.toDouble();
+        return true;
+    }
+
+    if(key == QStringLiteral("encodedAttributes"))
+    {
+        //qWarning() << "encodedAttributes not implemented";
+        return true;
+    }
+
+    return BaseContainer::parseProperty(key, value);
+}
diff --git a/sketchlib/container/textstyle.h b/sketchlib/container/textstyle.h
new file mode 100644
index 0000000..0accbb2
--- /dev/null
+++ b/sketchlib/container/textstyle.h
@@ -0,0 +1,24 @@
+#pragma once
+
+#include "basecontainer.h"
+#include "sketchlib_global.h"
+
+class QJsonObject;
+
+class SKETCHLIB_EXPORT TextStyle : public BaseContainer
+{
+    Q_OBJECT
+    Q_PROPERTY(double verticalAlignment READ verticalAlignment CONSTANT)
+
+public:
+    Q_INVOKABLE explicit TextStyle(QObject *parent = Q_NULLPTR);
+
+    double verticalAlignment() const;
+
+protected:
+    // BaseContainer interface
+    virtual bool parseProperty(const QString &key, const QJsonValue &value) Q_DECL_OVERRIDE;
+
+private:
+    double m_verticalAlignment;
+};
diff --git a/sketchlib/container/triangle.cpp b/sketchlib/container/triangle.cpp
new file mode 100644
index 0000000..4d2dde5
--- /dev/null
+++ b/sketchlib/container/triangle.cpp
@@ -0,0 +1,11 @@
+#include "triangle.h"
+
+Triangle::Triangle(QObject *parent) :
+    Layer(parent)
+{
+}
+
+bool Triangle::parseProperty(const QString &key, const QJsonValue &value)
+{
+    return Layer::parseProperty(key, value);
+}
diff --git a/sketchlib/container/triangle.h b/sketchlib/container/triangle.h
new file mode 100644
index 0000000..8014d81
--- /dev/null
+++ b/sketchlib/container/triangle.h
@@ -0,0 +1,16 @@
+#pragma once
+
+#include "layer.h"
+#include "sketchlib_global.h"
+
+class SKETCHLIB_EXPORT Triangle : public Layer
+{
+    Q_OBJECT
+
+public:
+    Q_INVOKABLE explicit Triangle(QObject *parent = Q_NULLPTR);
+
+protected:
+    // BaseContainer interface
+    virtual bool parseProperty(const QString &key, const QJsonValue &value) Q_DECL_OVERRIDE;
+};
diff --git a/sketchlib/containerfactory.cpp b/sketchlib/containerfactory.cpp
new file mode 100644
index 0000000..fbb3c71
--- /dev/null
+++ b/sketchlib/containerfactory.cpp
@@ -0,0 +1,149 @@
+#include "containerfactory.h"
+
+#include <QDebug>
+#include <QFile>
+#include <QJsonParseError>
+#include <QJsonDocument>
+#include <QJsonObject>
+
+#include "container/artboard.h"
+#include "container/assetcollection.h"
+#include "container/bitmap.h"
+#include "container/blur.h"
+#include "container/border.h"
+#include "container/borderoptions.h"
+#include "container/color.h"
+#include "container/document.h"
+#include "container/exportformat.h"
+#include "container/exportoptions.h"
+#include "container/fill.h"
+#include "container/gradient.h"
+#include "container/gradientstop.h"
+#include "container/graphicscontextsettings.h"
+#include "container/group.h"
+#include "container/imagecollection.h"
+#include "container/innershadow.h"
+#include "container/msimmutableforeignsymbol.h"
+#include "container/msjsonfilereference.h"
+#include "container/oval.h"
+#include "container/page.h"
+#include "container/polygon.h"
+#include "container/rect.h"
+#include "container/rectangle.h"
+#include "container/rulerdata.h"
+#include "container/shadow.h"
+#include "container/shapegroup.h"
+#include "container/shapepath.h"
+#include "container/sharedstyle.h"
+#include "container/sharedstylecontainer.h"
+#include "container/sharedtextstylecontainer.h"
+#include "container/slice.h"
+#include "container/style.h"
+#include "container/symbolcontainer.h"
+#include "container/symbolinstance.h"
+#include "container/symbolmaster.h"
+#include "container/text.h"
+#include "container/textstyle.h"
+#include "container/triangle.h"
+
+QHash<QString, QMetaObject> ContainerFactory::m_metaObjects {
+    { QStringLiteral("artboard"), Artboard::staticMetaObject },
+    { QStringLiteral("assetCollection"), AssetCollection::staticMetaObject },
+    { QStringLiteral("bitmap"), Bitmap::staticMetaObject },
+    { QStringLiteral("blur"), Blur::staticMetaObject },
+    { QStringLiteral("border"), Border::staticMetaObject },
+    { QStringLiteral("borderOptions"), BorderOptions::staticMetaObject },
+    { QStringLiteral("color"), Color::staticMetaObject },
+    { QStringLiteral("document"), Document::staticMetaObject },
+    { QStringLiteral("exportFormat"), ExportFormat::staticMetaObject },
+    { QStringLiteral("exportOptions"), ExportOptions::staticMetaObject },
+    { QStringLiteral("fill"), Fill::staticMetaObject },
+    { QStringLiteral("gradient"), Gradient::staticMetaObject },
+    { QStringLiteral("gradientStop"), GradientStop::staticMetaObject },
+    { QStringLiteral("graphicsContextSettings"), GraphicsContextSettings::staticMetaObject },
+    { QStringLiteral("group"), Group::staticMetaObject },
+    { QStringLiteral("imageCollection"), ImageCollection::staticMetaObject },
+    { QStringLiteral("innerShadow"), InnerShadow::staticMetaObject },
+    { QStringLiteral("MSImmutableForeignSymbol"), MSImmutableForeignSymbol::staticMetaObject },
+    { QStringLiteral("MSJSONFileReference"), MSJSONFileReference::staticMetaObject },
+    { QStringLiteral("oval"), Oval::staticMetaObject },
+    { QStringLiteral("page"), Page::staticMetaObject },
+    { QStringLiteral("polygon"), Polygon::staticMetaObject },
+    { QStringLiteral("rect"), Rect::staticMetaObject },
+    { QStringLiteral("rectangle"), Rectangle::staticMetaObject },
+    { QStringLiteral("rulerData"), RulerData::staticMetaObject },
+    { QStringLiteral("shadow"), Shadow::staticMetaObject },
+    { QStringLiteral("shapeGroup"), ShapeGroup::staticMetaObject },
+    { QStringLiteral("shapePath"), ShapePath::staticMetaObject },
+    { QStringLiteral("sharedStyle"), SharedStyle::staticMetaObject },
+    { QStringLiteral("sharedStyleContainer"), SharedStyleContainer::staticMetaObject },
+    { QStringLiteral("sharedTextStyleContainer"), SharedTextStyleContainer::staticMetaObject },
+    { QStringLiteral("slice"), Slice::staticMetaObject },
+    { QStringLiteral("style"), Style::staticMetaObject },
+    { QStringLiteral("symbolContainer"), SymbolContainer::staticMetaObject },
+    { QStringLiteral("symbolInstance"), SymbolInstance::staticMetaObject },
+    { QStringLiteral("symbolMaster"), SymbolMaster::staticMetaObject },
+    { QStringLiteral("text"), Text::staticMetaObject },
+    { QStringLiteral("textStyle"), TextStyle::staticMetaObject },
+    { QStringLiteral("triangle"), Triangle::staticMetaObject }
+};
+
+BaseContainer *ContainerFactory::createContainer(const QString &path, QObject *parent)
+{
+    QFile file(path);
+    if(!file.open(QIODevice::ReadOnly))
+        throw QStringLiteral("Could not open file %0 because %1").arg(path).arg(file.errorString());
+
+    return createContainer(file, parent);
+}
+
+BaseContainer *ContainerFactory::createContainer(QIODevice &device, QObject *parent)
+{
+    return createContainer(device.readAll(), parent);
+}
+
+BaseContainer *ContainerFactory::createContainer(const QByteArray &content, QObject *parent)
+{
+    QJsonParseError jsonParseError;
+    QJsonDocument jsonDocument = QJsonDocument::fromJson(content, &jsonParseError);
+    if(jsonParseError.error != QJsonParseError::NoError)
+        throw QStringLiteral("Could not parse json: %0").arg(jsonParseError.errorString());
+
+    return createContainer(jsonDocument, parent);
+}
+
+BaseContainer *ContainerFactory::createContainer(const QJsonDocument &jsonDocument, QObject *parent)
+{
+    if(!jsonDocument.isObject())
+        throw QStringLiteral("json document is not an object");
+
+    return createContainer(jsonDocument.object(), parent);
+}
+
+BaseContainer *ContainerFactory::createContainer(const QJsonObject &jsonObj, QObject *parent)
+{
+    if(!jsonObj.contains(QStringLiteral("_class")))
+        throw QStringLiteral("json does not contain _class");
+
+    auto classValue = jsonObj.value(QStringLiteral("_class"));
+
+    if(!classValue.isString())
+        throw QStringLiteral("_class is not a string");
+
+    auto classString = classValue.toString();
+
+    if(!m_metaObjects.contains(classString))
+        throw QStringLiteral("Unknown container type %0").arg(classString);
+
+    auto obj = m_metaObjects.value(classString).newInstance(Q_ARG(QObject *, parent));
+    if(!obj)
+        throw QStringLiteral("Container class could not be constructed");
+
+    auto container = qobject_cast<BaseContainer*>(obj);
+    if(!container)
+        throw QStringLiteral("Container object could be casted to BaseContainer");
+
+    container->parseFromJson(jsonObj);
+
+    return container;
+}
diff --git a/sketchlib/containerfactory.h b/sketchlib/containerfactory.h
new file mode 100644
index 0000000..ed638c5
--- /dev/null
+++ b/sketchlib/containerfactory.h
@@ -0,0 +1,41 @@
+#pragma once
+
+#include "sketchlib_global.h"
+
+#include <QObject>
+#include <QHash>
+
+class QIODevice;
+class QByteArray;
+class QJsonDocument;
+class QJsonObject;
+
+class BaseContainer;
+
+class SKETCHLIB_EXPORT ContainerFactory
+{
+    static QHash<QString, QMetaObject> m_metaObjects;
+
+public:
+    static BaseContainer* createContainer(const QString &path, QObject *parent = Q_NULLPTR);
+
+    static BaseContainer* createContainer(QIODevice &device, QObject *parent = Q_NULLPTR);
+
+    static BaseContainer* createContainer(const QByteArray &content, QObject *parent = Q_NULLPTR);
+
+    static BaseContainer* createContainer(const QJsonDocument &jsonDocument, QObject *parent = Q_NULLPTR);
+
+    static BaseContainer* createContainer(const QJsonObject &jsonObj, QObject *parent = Q_NULLPTR);
+
+    template<typename T1, typename T2>
+    static T1* createContainer(const T2 &arg, QObject *parent = Q_NULLPTR)
+    {
+        auto container = createContainer(arg, parent);
+        auto castedContainer = qobject_cast<T1*>(container);
+
+        if(!castedContainer)
+            throw QStringLiteral("not expected type");
+
+        return castedContainer;
+    }
+};
diff --git a/sketchlib/layer.cpp b/sketchlib/layer.cpp
new file mode 100644
index 0000000..85d3473
--- /dev/null
+++ b/sketchlib/layer.cpp
@@ -0,0 +1,226 @@
+#include "layer.h"
+
+#include <QDebug>
+#include <QJsonValue>
+#include <QJsonObject>
+
+#include "containerfactory.h"
+
+#include "container/rect.h"
+#include "container/style.h"
+#include "container/exportoptions.h"
+
+Layer::Layer(QObject *parent) :
+    BaseContainer(parent),
+    m_frame(Q_NULLPTR),
+    m_isFlippedVertical(false),
+    m_isFlippedHorizontal(false),
+    m_isVisible(false),
+    m_resizingConstraints(ResizingConstraint::None),
+    m_rotation(0.),
+    m_style(Q_NULLPTR),
+    m_exportOptions(Q_NULLPTR),
+    m_isLocked(false),
+    m_resizingConstraint(0.),
+    m_resizingType(0.),
+    m_shouldBreakMaskChain(false),
+    m_layerListExpandedType(0.)
+{
+}
+
+const QString &Layer::do_objectID() const
+{
+    return m_do_objectID;
+}
+
+const QString &Layer::name() const
+{
+    return m_name;
+}
+
+bool Layer::nameIsFixed() const
+{
+    return m_nameIsFixed;
+}
+
+Rect *Layer::frame() const
+{
+    return m_frame;
+}
+
+bool Layer::isFlippedVertical() const
+{
+    return m_isFlippedVertical;
+}
+
+bool Layer::isFlippedHorizontal() const
+{
+    return m_isFlippedHorizontal;
+}
+
+bool Layer::isVisible() const
+{
+    return m_isVisible;
+}
+
+Layer::ResizingConstraint Layer::resizingConstraints() const
+{
+    return m_resizingConstraints;
+}
+
+double Layer::rotation() const
+{
+    return m_rotation;
+}
+
+Style *Layer::style() const
+{
+    return m_style;
+}
+
+ExportOptions *Layer::exportOptions() const
+{
+    return m_exportOptions;
+}
+
+bool Layer::isLocked() const
+{
+    return m_isLocked;
+}
+
+double Layer::resizingConstraint() const
+{
+    return m_resizingConstraint;
+}
+
+double Layer::resizingType() const
+{
+    return m_resizingType;
+}
+
+bool Layer::shouldBreakMaskChain() const
+{
+    return m_shouldBreakMaskChain;
+}
+
+double Layer::layerListExpandedType() const
+{
+    return m_layerListExpandedType;
+}
+
+bool Layer::parseProperty(const QString &key, const QJsonValue &value)
+{
+    if(key == QStringLiteral("do_objectID"))
+    {
+        Q_ASSERT(value.isString());
+        m_do_objectID = value.toString();
+        return true;
+    }
+
+    if(key == QStringLiteral("name"))
+    {
+        Q_ASSERT(value.isString());
+        m_name = value.toString();
+        return true;
+    }
+
+    if(key == QStringLiteral("nameIsFixed"))
+    {
+        Q_ASSERT(value.isBool());
+        m_nameIsFixed = value.toBool();
+        return true;
+    }
+
+    if(key == QStringLiteral("frame"))
+    {
+        Q_ASSERT(value.isObject());
+        m_frame = ContainerFactory::createContainer<Rect>(value.toObject());
+        return true;
+    }
+
+    if(key == QStringLiteral("isFlippedVertical"))
+    {
+        Q_ASSERT(value.isBool());
+        m_isFlippedVertical = value.toBool();
+        return true;
+    }
+
+    if(key == QStringLiteral("isFlippedHorizontal"))
+    {
+        Q_ASSERT(value.isBool());
+        m_isFlippedHorizontal = value.toBool();
+        return true;
+    }
+
+    if(key == QStringLiteral("isVisible"))
+    {
+        Q_ASSERT(value.isBool());
+        m_isVisible = value.toBool();
+        return true;
+    }
+
+    if(key == QStringLiteral("resizingConstraints"))
+    {
+        Q_ASSERT(value.isDouble());
+        m_resizingConstraints = ResizingConstraint(int(value.toDouble()));
+        return true;
+    }
+
+    if(key == QStringLiteral("rotation"))
+    {
+        Q_ASSERT(value.isDouble());
+        m_rotation = value.toDouble();
+        return true;
+    }
+
+    if(key == QStringLiteral("style"))
+    {
+        Q_ASSERT(value.isObject());
+        m_style = ContainerFactory::createContainer<Style>(value.toObject());
+        return true;
+    }
+
+    if(key == QStringLiteral("exportOptions"))
+    {
+        Q_ASSERT(value.isObject());
+        m_exportOptions = ContainerFactory::createContainer<ExportOptions>(value.toObject());
+        return true;
+    }
+
+    if(key == QStringLiteral("isLocked"))
+    {
+        Q_ASSERT(value.isBool());
+        m_isLocked = value.toBool();
+        return true;
+    }
+
+    if(key == QStringLiteral("resizingConstraint"))
+    {
+        Q_ASSERT(value.isDouble());
+        m_resizingConstraint = value.toDouble();
+        return true;
+    }
+
+    if(key == QStringLiteral("resizingType"))
+    {
+        Q_ASSERT(value.isDouble());
+        m_resizingType = value.toDouble();
+        return true;
+    }
+
+    if(key == QStringLiteral("shouldBreakMaskChain"))
+    {
+        Q_ASSERT(value.isBool());
+        m_shouldBreakMaskChain = value.toBool();
+        return true;
+    }
+
+    if(key == QStringLiteral("layerListExpandedType"))
+    {
+        Q_ASSERT(value.isDouble());
+        m_layerListExpandedType = value.toDouble();
+        return true;
+    }
+
+    return BaseContainer::parseProperty(key, value);
+}
diff --git a/sketchlib/layer.h b/sketchlib/layer.h
new file mode 100644
index 0000000..c7e0c88
--- /dev/null
+++ b/sketchlib/layer.h
@@ -0,0 +1,87 @@
+#pragma once
+
+#include "basecontainer.h"
+#include "sketchlib_global.h"
+
+class Rect;
+class Style;
+class ExportOptions;
+
+class SKETCHLIB_EXPORT Layer : public BaseContainer
+{
+    Q_OBJECT
+    Q_PROPERTY(QString do_objectID READ do_objectID CONSTANT)
+    Q_PROPERTY(QString name READ name CONSTANT)
+    Q_PROPERTY(bool nameIsFixed READ nameIsFixed CONSTANT)
+    Q_PROPERTY(Rect* frame READ frame CONSTANT)
+    Q_PROPERTY(bool isFlippedVertical READ isFlippedVertical CONSTANT)
+    Q_PROPERTY(bool isFlippedHorizontal READ isFlippedHorizontal CONSTANT)
+    Q_PROPERTY(bool isVisible READ isVisible CONSTANT)
+    Q_PROPERTY(ResizingConstraint resizingConstraints READ resizingConstraints CONSTANT)
+    Q_PROPERTY(double rotation READ rotation CONSTANT)
+    Q_PROPERTY(Style* style READ style CONSTANT)
+    Q_PROPERTY(ExportOptions* exportOptions READ exportOptions CONSTANT)
+    Q_PROPERTY(bool isLocked READ isLocked CONSTANT)
+    Q_PROPERTY(double resizingConstraint READ resizingConstraint CONSTANT)
+    Q_PROPERTY(double resizingType READ resizingType CONSTANT)
+    Q_PROPERTY(bool shouldBreakMaskChain READ shouldBreakMaskChain CONSTANT)
+    Q_PROPERTY(double layerListExpandedType READ layerListExpandedType CONSTANT)
+
+protected:
+    explicit Layer(QObject *parent = Q_NULLPTR);
+
+public:
+    enum ResizingConstraint
+    {
+        None = 0,
+        FlexibleRightMargin = 1,
+        FlexibleWidth = 2,
+        FlexibleLeftMargin = 4,
+        FlexibleBottomMargin = 8,
+        FlexibleHeight = 16,
+        FlexibleTopMargin = 32
+    };
+    Q_DECLARE_FLAGS(ResizingConstraints, ResizingConstraint)
+    Q_FLAG(ResizingConstraints)
+
+    const QString &do_objectID() const;
+    const QString &name() const;
+    bool nameIsFixed() const;
+    Rect *frame() const;
+    bool isFlippedVertical() const;
+    bool isFlippedHorizontal() const;
+    bool isVisible() const;
+    ResizingConstraint resizingConstraints() const;
+    double rotation() const;
+    Style *style() const;
+    ExportOptions *exportOptions() const;
+    bool isLocked() const;
+    double resizingConstraint() const;
+    double resizingType() const;
+    bool shouldBreakMaskChain() const;
+    double layerListExpandedType() const;
+
+protected:
+    // BaseContainer interface
+    virtual bool parseProperty(const QString &key, const QJsonValue &value) Q_DECL_OVERRIDE;
+
+private:
+    QString m_do_objectID;
+    QString m_name;
+    bool m_nameIsFixed;
+    Rect *m_frame;
+    bool m_isFlippedVertical;
+    bool m_isFlippedHorizontal;
+    bool m_isVisible;
+    ResizingConstraint m_resizingConstraints;
+    double m_rotation;
+    Style *m_style;
+    ExportOptions *m_exportOptions;
+    bool m_isLocked;
+    double m_resizingConstraint;
+    double m_resizingType;
+    bool m_shouldBreakMaskChain;
+    double m_layerListExpandedType;
+};
+
+Q_DECLARE_OPERATORS_FOR_FLAGS(Layer::ResizingConstraints)
diff --git a/sketchlib/sketchfile.cpp b/sketchlib/sketchfile.cpp
new file mode 100644
index 0000000..a2f40dd
--- /dev/null
+++ b/sketchlib/sketchfile.cpp
@@ -0,0 +1,179 @@
+#include "sketchfile.h"
+
+#include <QDebug>
+#include <QGraphicsScene>
+#include <QGraphicsTextItem>
+#include <QGraphicsPixmapItem>
+
+#include "quazip.h"
+#include "quazipfile.h"
+
+#include "containerfactory.h"
+
+#include "container/document.h"
+#include "container/msjsonfilereference.h"
+#include "container/page.h"
+#include "container/rect.h"
+#include "container/group.h"
+#include "container/text.h"
+#include "container/bitmap.h"
+#include "container/rectangle.h"
+
+SketchFile::SketchFile(QObject *parent) :
+    QObject(parent),
+    m_document(Q_NULLPTR),
+    m_zip(Q_NULLPTR)
+{
+}
+
+const QString &SketchFile::filename() const
+{
+    return m_filename;
+}
+
+Document *SketchFile::document() const
+{
+    return m_document;
+}
+
+void SketchFile::open(const QString &filename)
+{
+    if(m_filename != filename)
+        Q_EMIT filenameChanged(m_filename = filename);
+
+    delete m_zip;
+
+    m_zip = new QuaZip(filename);
+    if(!m_zip->open(QuaZip::mdUnzip))
+        throw tr("Could not unzip sketch file!");
+
+    if(m_document)
+        m_document->deleteLater();
+
+    m_document = createContainerZip<Document>(QStringLiteral("document.json"), this);
+    Q_EMIT documentChanged(m_document);
+}
+
+Page *SketchFile::loadPage(const QString &filename)
+{
+    return createContainerZip<Page>(filename + ".json", this);
+}
+
+QGraphicsScene *SketchFile::createScene(const QString &filename, QObject *parent)
+{
+    Page *page;
+    try
+    {
+        page = loadPage(filename);
+    } catch (QString msg) {
+        throw tr("Could not parse page: %0").arg(msg);
+    }
+
+    QGraphicsScene *scene;
+    try
+    {
+        scene = createScene(page, parent);
+    } catch (QString msg) {
+        throw tr("Could not render page: %0").arg(msg);
+    }
+
+    return scene;
+}
+
+QGraphicsScene *SketchFile::createScene(Page *page, QObject *parent)
+{
+    auto minX = page->frame()->x(), minY = page->frame()->y(),
+         maxX = page->frame()->x() + page->frame()->width(),
+         maxY = page->frame()->y() + page->frame()->height();
+
+    getBoundsRecursive(page, minX, minY, maxX, maxY, 0., 0.);
+
+    auto scene = new QGraphicsScene(minX, minY, maxX - minX + 1.,  maxY - minY + 1., parent);
+
+    renderItemsRecursive(scene, page, 0., 0.);
+
+    return scene;
+}
+
+void SketchFile::getBoundsRecursive(Layer *layer, double &minX, double &minY, double &maxX, double &maxY, double xOffset, double yOffset)
+{
+    auto x = xOffset + layer->frame()->x();
+    auto y = yOffset + layer->frame()->y();
+    if(minX > x)
+        minX = x;
+    if(minY > y)
+        minY = y;
+    if(maxX < x + layer->frame()->width())
+        maxX = x + layer->frame()->width();
+    if(maxY < y + layer->frame()->height())
+        maxY = y + layer->frame()->height();
+
+    if(auto group = qobject_cast<Group*>(layer))
+    {
+        for(auto subLayer : group->layers())
+            getBoundsRecursive(subLayer, minX, minY, maxX, maxY, x, y);
+    }
+}
+
+void SketchFile::renderItemsRecursive(QGraphicsScene *scene, Layer *layer, double xOffset, double yOffset)
+{
+    if(auto text = qobject_cast<Text*>(layer))
+    {
+        auto textItem = scene->addText(text->name());
+        textItem->setPos(xOffset + text->frame()->x(), yOffset + text->frame()->y());
+    }
+    else if(auto bitmap = qobject_cast<Bitmap*>(layer))
+    {
+        auto path = bitmap->image()->_ref() + ".png";
+
+        if(!m_zip->setCurrentFile(path))
+        {
+            qWarning() << "could not unzip" << path;
+            return;
+        }
+
+        QuaZipFile file(m_zip);
+        if(!file.open(QIODevice::ReadOnly))
+        {
+            qWarning() << "Could not open" << path << "because" << file.errorString();
+            return;
+        }
+
+        QImage image;
+        if(!image.load(&file, "PNG"))
+        {
+            qWarning() << "could not load image";
+            return;
+        }
+
+        auto bitmapItem = scene->addPixmap(QPixmap::fromImage(image.scaled(bitmap->frame()->width(), bitmap->frame()->height())));
+        bitmapItem->setPos(xOffset + bitmap->frame()->x(), yOffset + bitmap->frame()->y());
+    }
+    else if(auto group = qobject_cast<Group*>(layer))
+    {
+        for(auto subLayer : group->layers())
+            renderItemsRecursive(scene, subLayer, xOffset + subLayer->frame()->x(), yOffset + subLayer->frame()->y());
+    }
+
+    scene->addRect(xOffset + layer->frame()->x(), yOffset + layer->frame()->y(),
+                   layer->frame()->width(), layer->frame()->height());
+}
+
+template<typename T>
+T* SketchFile::createContainerZip(const QString &filename, QObject *parent)
+{
+    if(!m_zip->setCurrentFile(filename))
+        throw QStringLiteral("Could not set to %0").arg(filename);
+
+    QuaZipFile file(m_zip);
+    if(!file.open(QIODevice::ReadOnly))
+        throw QStringLiteral("Could not open %0 because %1").arg(filename, file.errorString());
+
+    auto container = ContainerFactory::createContainer(file, parent);
+    auto castedContainer = qobject_cast<T*>(container);
+
+    if(castedContainer)
+        return castedContainer;
+    else
+        throw QStringLiteral("not expected type");
+}
diff --git a/sketchlib/sketchfile.h b/sketchlib/sketchfile.h
new file mode 100644
index 0000000..f6fece1
--- /dev/null
+++ b/sketchlib/sketchfile.h
@@ -0,0 +1,46 @@
+#pragma once
+
+#include <QObject>
+#include "sketchlib_global.h"
+
+class QGraphicsScene;
+
+class QuaZip;
+
+class Document;
+class Page;
+class Layer;
+
+class SKETCHLIB_EXPORT SketchFile : public QObject
+{
+    Q_OBJECT
+    Q_PROPERTY(QString filename READ filename NOTIFY filenameChanged)
+    Q_PROPERTY(Document* document READ document NOTIFY documentChanged)
+
+public:
+    explicit SketchFile(QObject *parent = nullptr);
+
+    const QString &filename() const;
+    Document *document() const;
+
+    void open(const QString &filename);
+    Page *loadPage(const QString &filename);
+    QGraphicsScene *createScene(const QString &filename, QObject *parent = Q_NULLPTR);
+    QGraphicsScene *createScene(Page *page, QObject *parent = Q_NULLPTR);
+
+Q_SIGNALS:
+    void filenameChanged(const QString &filename);
+    void documentChanged(Document *document);
+
+private:
+    template<typename T>
+    T* createContainerZip(const QString &filename, QObject *parent = Q_NULLPTR);
+
+    static void getBoundsRecursive(Layer *layer, double &minX, double &minY, double &maxX, double &maxY, double xOffset, double yOffset);
+    void renderItemsRecursive(QGraphicsScene *scene, Layer *layer,double xOffset, double yOffset);
+
+    QString m_filename;
+    Document *m_document;
+
+    QuaZip *m_zip;
+};
diff --git a/sketchlib/sketchlib.pro b/sketchlib/sketchlib.pro
new file mode 100644
index 0000000..14cb0b2
--- /dev/null
+++ b/sketchlib/sketchlib.pro
@@ -0,0 +1,105 @@
+QT += core gui widgets
+
+DBLIBS += quazip
+
+PROJECT_ROOT = ../..
+
+DEFINES += SKETCHLIB_LIBRARY
+
+SOURCES += \
+    basecontainer.cpp \
+    containerfactory.cpp \
+    layer.cpp \
+    sketchfile.cpp \
+    container/artboard.cpp \
+    container/assetcollection.cpp \
+    container/bitmap.cpp \
+    container/blur.cpp \
+    container/border.cpp \
+    container/borderoptions.cpp \
+    container/color.cpp \
+    container/document.cpp \
+    container/exportformat.cpp \
+    container/exportoptions.cpp \
+    container/fill.cpp \
+    container/gradient.cpp \
+    container/gradientstop.cpp \
+    container/graphicscontextsettings.cpp \
+    container/group.cpp \
+    container/imagecollection.cpp \
+    container/innershadow.cpp \
+    container/msimmutableforeignsymbol.cpp \
+    container/msjsonfilereference.cpp \
+    container/oval.cpp \
+    container/page.cpp \
+    container/polygon.cpp \
+    container/rect.cpp \
+    container/rectangle.cpp \
+    container/rulerdata.cpp \
+    container/shadow.cpp \
+    container/shapegroup.cpp \
+    container/shapepath.cpp \
+    container/sharedstyle.cpp \
+    container/sharedstylecontainer.cpp \
+    container/sharedtextstylecontainer.cpp \
+    container/slice.cpp \
+    container/style.cpp \
+    container/symbolcontainer.cpp \
+    container/symbolinstance.cpp \
+    container/symbolmaster.cpp \
+    container/text.cpp \
+    container/textstyle.cpp \
+    container/triangle.cpp
+
+HEADERS += sketchlib_global.h \
+    basecontainer.h \
+    containerfactory.h \
+    layer.h \
+    sketchfile.h \
+    container/artboard.h \
+    container/assetcollection.h \
+    container/bitmap.h \
+    container/blur.h \
+    container/border.h \
+    container/borderoptions.h \
+    container/color.h \
+    container/document.h \
+    container/exportformat.h \
+    container/exportoptions.h \
+    container/fill.h \
+    container/gradient.h \
+    container/gradientstop.h \
+    container/graphicscontextsettings.h \
+    container/group.h \
+    container/imagecollection.h \
+    container/innershadow.h \
+    container/msimmutableforeignsymbol.h \
+    container/msjsonfilereference.h \
+    container/oval.h \
+    container/page.h \
+    container/polygon.h \
+    container/rect.h \
+    container/rectangle.h \
+    container/rulerdata.h \
+    container/shadow.h \
+    container/shapegroup.h \
+    container/shapepath.h \
+    container/sharedstyle.h \
+    container/sharedstylecontainer.h \
+    container/sharedtextstylecontainer.h \
+    container/slice.h \
+    container/style.h \
+    container/symbolcontainer.h \
+    container/symbolinstance.h \
+    container/symbolmaster.h \
+    container/text.h \
+    container/textstyle.h \
+    container/triangle.h
+
+FORMS +=
+
+RESOURCES +=
+
+TRANSLATIONS +=
+
+include($${PROJECT_ROOT}/lib.pri)
diff --git a/sketchlib/sketchlib_global.h b/sketchlib/sketchlib_global.h
new file mode 100644
index 0000000..062b45a
--- /dev/null
+++ b/sketchlib/sketchlib_global.h
@@ -0,0 +1,9 @@
+#pragma once
+
+#include <QtGlobal>
+
+#if defined(SKETCHLIB_LIBRARY)
+#  define SKETCHLIB_EXPORT Q_DECL_EXPORT
+#else
+#  define SKETCHLIB_EXPORT Q_DECL_IMPORT
+#endif
diff --git a/sketchviewer/main.cpp b/sketchviewer/main.cpp
new file mode 100644
index 0000000..1a190b7
--- /dev/null
+++ b/sketchviewer/main.cpp
@@ -0,0 +1,81 @@
+#include <QApplication>
+#include <QDirIterator>
+#include <QTabWidget>
+#include <QLabel>
+#include <QGraphicsView>
+#include <QDebug>
+
+#include "sketchfile.h"
+#include "container/document.h"
+#include "container/page.h"
+#include "container/msjsonfilereference.h"
+
+int main(int argc, char *argv[])
+{
+    QApplication a(argc, argv);
+
+    qSetMessagePattern(QStringLiteral("%{time dd.MM.yyyy HH:mm:ss.zzz} "
+                                      "["
+                                      "%{if-debug}D%{endif}"
+                                      "%{if-info}I%{endif}"
+                                      "%{if-warning}W%{endif}"
+                                      "%{if-critical}C%{endif}"
+                                      "%{if-fatal}F%{endif}"
+                                      "] "
+                                      "%{function}(): "
+                                      "%{message}"));
+
+    auto parentWidget = new QTabWidget;
+
+    QDirIterator iter(QStringLiteral("sketches"), QStringList { QStringLiteral("*.sketch") }, QDir::Files);
+    while(iter.hasNext())
+    {
+        SketchFile file;
+
+        auto filename = iter.next();
+        try {
+            file.open(filename);
+        } catch(QString msg) {
+            parentWidget->addTab(new QLabel(QStringLiteral("<span style=\"color: red;\">Could not load sketch file: %0</span>").arg(msg), parentWidget), filename);
+            continue;
+        }
+
+        auto tabWidget = new QTabWidget(parentWidget);
+
+        for(auto pageRef : file.document()->pages())
+        {
+            Page *page;
+            try
+            {
+                page = file.loadPage(pageRef->_ref());
+            } catch (QString msg) {
+                tabWidget->addTab(new QLabel(QStringLiteral("<span style=\"color: red;\">Could not parse page: %0</span>").arg(msg), tabWidget), pageRef->_ref());
+                continue;
+            }
+
+            QGraphicsScene *scene;
+            try
+            {
+                scene = file.createScene(page);
+            } catch (QString msg) {
+                tabWidget->addTab(new QLabel(QStringLiteral("<span style=\"color: red;\">Could not render page: %0</span>").arg(msg), tabWidget), page->name());
+                continue;
+            }
+
+            tabWidget->addTab(new QGraphicsView(scene, tabWidget), page->name());
+        }
+
+        parentWidget->addTab(tabWidget, file.filename());
+    }
+
+    parentWidget->show();
+
+    qDebug() << "summary of missing properties:";
+    {
+        const auto &missing = BaseContainer::missing();
+        for(auto iter = missing.constBegin(); iter != missing.constEnd(); iter++)
+            qDebug() << iter.key() << iter.value();
+    }
+
+    return a.exec();
+}
diff --git a/sketchviewer/sketchviewer.pro b/sketchviewer/sketchviewer.pro
new file mode 100644
index 0000000..d6f7e2c
--- /dev/null
+++ b/sketchviewer/sketchviewer.pro
@@ -0,0 +1,17 @@
+QT += core gui widgets
+
+DBLIBS += sketchlib
+
+PROJECT_ROOT = ../..
+
+SOURCES += main.cpp
+
+HEADERS +=
+
+FORMS +=
+
+RESOURCES +=
+
+TRANSLATIONS +=
+
+include($${PROJECT_ROOT}/app.pri)