Implemented DocumentReader for GuiDocument.xml reading. Final

src/Base/Persistence.cpp

@@ -34,6 +34,10 @@
 /// Here the FreeCAD includes sorted by Base,App,Gui......
 #include "Persistence.h"
 
+#ifndef _PreComp_
+# include <xercesc/dom/DOM.hpp>
+#endif
+
 
 using namespace Base;
 
@@ -63,8 +67,10 @@ void Persistence::Save (Writer &/*writer*/) const
 
 void Persistence::Restore(DocumentReader &/*reader*/)
 {
-    // you have to implement this method in all descending classes!
-    assert(0);
+}
+
+void Persistence::Restore(DocumentReader &/*reader*/,XERCES_CPP_NAMESPACE_QUALIFIER DOMElement */*containerEl*/)
+{
 }
 
 void Persistence::Restore(XMLReader &/*reader*/)