Libxslt Extension Modules
Although libxml2 and libxslt are widely available, unfortunately they implement only XPath 1.0 and XSL-T 1.0. Therefore a lot of useful features are missing, particularly XPath functions.
This collection implements various extension elements and functions for libxslt that have proved useful in a few projects. The functions or elements actually implemented follow no particular plan, rather they are somewhat randomly chosen based on immediate need over time.
In principle the XPath extension functions are independent of libxslt and could be implemented using only libxml2, however the extension modules rely on the module loading mechanism in libxslt and so they are only available when used through an XSL-T stylesheet.
They attempt to follow the specifications from exslt.org or XPath 2.0 functions where feasible, although some functions appear in neither specification. Since XPath 2.0 has a number of features not present in the libxml2 implementation, corresponding implementations are at most similar rather than identical.
Copyright & Licence
The Libxslt Extension Modules are copyright © 2020 Brian Stafford. They are released under the MIT Licence since this is the licence used by libxml2 and libxslt.