All other program based on libfolia will accept this
foliavalidator DOES reject it:
$ foliavalidator tests/proctest.xml
Error on line 0: IDREF attribute processor references an unknown ID "fubar"
VALIDATION ERROR against RelaxNG schema (stage 1/3), in tests/proctest.xml
IDREF attribute processor references an unknown ID "fubar"
given this FoLiA:
This is INVALID, because the processor ''fubar'' is never defined. But we happily parse this:
All other program based on libfolia will accept this
foliavalidator DOES reject it: