if (simpleXMLFormatDescriptor == null) {
simpleXMLFormatDescriptor = new XMLDescriptor();
simpleXMLFormatDescriptor.setJavaClass(SimpleXMLFormatModel.class);
simpleXMLFormatDescriptor.setAlias(DEFAULT_SIMPLE_XML_FORMAT_TAG);
simpleXMLFormatDescriptor.setDefaultRootElement(DEFAULT_SIMPLE_XML_FORMAT_TAG);
XMLFragmentCollectionMapping xmlTag = new XMLFragmentCollectionMapping();
xmlTag.setAttributeName(SIMPLEXML_STR);
xmlTag.setXPath(DEFAULT_SIMPLE_XML_TAG);
simpleXMLFormatDescriptor.addMapping(xmlTag);
NamespaceResolver nr = new NamespaceResolver();
simpleXMLFormatDescriptor.setNamespaceResolver(nr);
XMLSchemaURLReference schemaReference = new XMLSchemaURLReference(EMPTY_STR);
schemaReference.setSchemaContext(SIMPLEXML_FORMAT_STR);