Feature #6287
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User extension function for the C++, PHP and Python APIs
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Description
SaxonC 12 currently does not support user extension functions written in the languages C++, PHP and Python.
We used to support this feature in SaxonC 11, but since we have moved from using Excelsior Jet to Graalvm as the underlying JVM engine it is no longer straightforward to reuse the JNI mechanism to do the callbacks for the extension functions.
Following a user request on stackoverflow (i.e. https://stackoverflow.com/questions/77641333/use-external-user-python-functions-in-a-xml-or-xslt-by-using-saxonc-12-4-for-pyt), I am adding this issue as a feature request for SaxonC 12.
On the Graalvm slack I have been advised that we can call C/C++ method from Java code in native using CFunction.
Also to consider that "C++ method is hard, you need a C proxy that calls desired method".
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