A DESCRIPTION OF THE PROBLEM :
Currently, only XPath 1.0 is supported, instead of the current version 3.1
The concrete use case that led me to file this enhancement: trying to query an HTML file by making use of the `tokenize` function. However, this function was only introduced in XPath 2.0.
If full XPath support is not feasible: it would be great if the functions of later releases would be supported: https://www.w3.org/TR/xpath-functions/