code: public static DocumentBuilderFactory getDocumentBuilderFactory(final String schema)
  	{
  		System.setProperty(DOCUMENT_BUILDER_FACTORY_KEY, DOCUMENT_BUILDER_FACTORY_VALUE);
  		final DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
  		factory.setNamespaceAware(true);
  		factory.setValidating(true);
  		factory.setAttribute(SCHEMA_LANGUAGE_KEY, HTTP_WWW_W3_ORG_2001_XML_SCHEMA);
  		factory.setAttribute(SCHEMA_SOURCE_KEY, schema);
  		return factory;
  	}
docs: Gets the document builder factory.
  
  @param schema
  the schema
  @return the document builder factory