XProc and iXML

Dear XProc friends,

In a repository I have started collecting tools, utilities and use patterns related to iXML (Invisible XML): https://github.com/usnistgov/ixml-breadboard

This includes XProc materials, building on Norm's fantastic work at nineml.org and others.

There is one thing I can't get working yet, however, under XML Calabash using Saxon-HE, namely configure Saxon's extension functionality to use Norm's CoffeeSacks XSLT extension. (Saxon-HE is extensible only by means of an initialization called either programmatically or via an -init flag). Here is an XProc:

https://github.com/usnistgov/ixml-breadboard/blob/main/src/mini/invisible-saxon.xpl

Questions:

  1.  Leaving aside XML Calabash (Norm being pleasantly engaged otherwise), is there anything I can do to make this work using XProc 1.0? am I missing something?
  2.  Should I be doing this under XProc 3.0? Does Morgana (or any XProc 3.0 processor) permit me to configure Saxon-HE and distribute an all-open source, unencumbered XProc runtime to users of pipelines with these dependencies, including iXML?

Thanks for any advice you can offer -

Best regards,
Wendell