Expression parser as Saxon extension function.

[tgraham-antenna]

REx can also generate a parser as a Saxon extension function.

It should be possible, and it should be faster, to use the expression parser as a Saxon extension function and fallback to the XSLT expression parser when the Saxon extension function is not available.

[tgraham-antenna]

Advice from oXygen support is that it's not possible to directly set the classpath for Saxon when it runs Schematron. Best possible solution seems to be to add the jar in the Saxon config for oXygen as a whole, but that's not something that can be done just by downloading an add-on.