add make test_xml

this is usefull to detect XML problems

docs/Makefile.in

@@ -26,6 +26,7 @@ LANG=@LANG@
 NSGMLS=@NSGMLS@
 JADE=@JADE@  -D . -wno-idref
 XSLTPROC=@XSLTPROC@
+XMLLINT=@XMLLINT@
 FOP=@FOP@
 XMLDCL=./dtds/dbxml-4.1.2/phpdocxml.dcl
 CATALOG=@CATALOG@
@@ -57,6 +58,8 @@ pdf: FORCE
 test:
 	$(NSGMLS) -i lang-$(LANG) -s $(XMLDCL) manual.xml 
 
+test_xml:
+	$(XMLLINT) --noent --noout --valid manual.xml
 
 revcheck: FORCE
 	$(PHP) -f scripts/revcheck.php $(LANG) > revcheck.html

docs/README

@@ -10,6 +10,7 @@ Firstly issue these commands:
 
 TEST:
  * make test
+ * make test_xml (test for XML validity)
 
 MAKE:
  * make (to make plain html)

docs/configure.in

@@ -240,7 +240,7 @@ AC_ARG_WITH(fop,
   fi
 ],[
   if test -e ../../phpdoc-tools/fop/fop.bat ; then
-    AC_MSG_CHECKING([for xsltproc])
+    AC_MSG_CHECKING([for FOP])
     FOP=../../phpdoc-tools/fop/fop.bat
     AC_MSG_RESULT($FOP)
   else
@@ -255,6 +255,48 @@ AC_SUBST(FOP)
 
 dnl }}}
 
+dnl {{{   check for xmllint
+
+AC_ARG_WITH(xmllint,
+[  --with-xmllint=PATH     check for xmllint],
+[
+  if test $withval != "yes"; then
+    AC_MSG_CHECKING([for xmllint])
+    if test -x $withval -a -f $withval
+    then
+      XMLLINT=$withval
+      AC_MSG_RESULT($XMLLINT)
+    else
+      XMLLINT=no
+      AC_MSG_RESULT(no)
+      AC_MSG_ERROR([$withval: no xmllint binary found])
+    fi
+  else
+    if test -e ../../phpdoc-tools/libxml/xmllint.exe ; then
+      AC_MSG_CHECKING([for xmllint])
+      XSLTPROC=../../phpdoc-tools/libxml/xmllint.exe
+      AC_MSG_RESULT($XMLLINT)
+    else
+      AC_PATH_PROG(XMLLINT,"xmllint",no)
+    fi
+  fi
+],[
+  if test -e ../../phpdoc-tools/libxml/xmllint.exe ; then
+    AC_MSG_CHECKING([for xmllint])
+    XMLLINT=../../phpdoc-tools/libxml/xmllint.exe
+    AC_MSG_RESULT($XMLLINT)
+  else
+    AC_PATH_PROG(XMLLINT,"xmllint",no)
+  fi
+]
+)
+if test $XMLLINT = "no"; then
+  AC_MSG_WARN([no xmllint binary found, XML Validation won't work])
+fi
+AC_SUBST(XMLLINT)
+
+dnl }}}
+
 dnl }}}
 
 dnl {{{   check for catalog files