I do not know what this is in reference to, so I cannot route this to the right place. Is this some part of LabVIEW? Part of Report Generation Toolkit? Part of some other NI product? Please clarify for me what you're asking NI to upgrade/fix so I can flag the right people.
XPath 3.1 became W3C Candidate Recommendation on December 2014, it seems there are very few XML Parser libraries that has implemented XPath 3.1.
The "XML Parser VIs and Nodes" in LabVIEW relies on the underlying Xerces-C library to support querying XML document with its XPath feature, it will be straightforward for XML Parser VIs to support XPath 3.1 if the Xerces-C library can support it first.
Any idea that has received less than 3 kudos within 3 years after posting will be automatically declined.