Is VTD-XML conformant?
VTD-XML fully conforms to W3C XML 1.0 recommendation with the exception of DTD and external entity. It passes all the relevant conformance tests. VTD-XML (since v 2.9) fully conforms to XML Namespace 1.0 spec. VTD-XML fully conforms with W3C XPath 1.0 recommendation. It supports all the built-in functions. It also supports many XPath 2.0 functions.