This package provides standard conformant XPath 2.0, XQuery 1.0 and XPath/XQuery 3.0 interpreters with extensions for - among others - JSONiq, pattern matching, CSS and HTML; as well as functions to perform HTTP/S requests on Windows/Linux/MacOSX/Android, an XSLT-inspired webscraping language, and an auto update class.
See my webpage for the detailed internettools documentation or a short overview.
You can also test the XQuery engine with its online cgi service.