modiied libxml2. based on libxml2-2.9.9
Original library can be found at xmlsoft.org
Added Annotation creation during validation by using validation option xmlSchemaSetValidOptions(ctxt,XML_SCHEMA_VAL_ANNOT_CREATE);
XSD element annotations (xs:annotationxs:documentationelement annotation</xs:documentation></xs:annotation>) appends to document as new comment nodes.
