RDF example encoding differs between source file and build-local/tests copy fed to transforms

Summary

I have a text/turtle example and a python transform that reads it using the prov library:

from prov.model import ProvDocument
document = ProvDocument.deserialize(content=input_data, format="rdf", rdf_format="turtle")

When I run this exact code myself directly on my source example file, it works fine.

When the postprocessor runs the same transform on the same example, it fails with:

prov.model.records.ProvExceptionInvalidQualifiedName: Invalid Qualified Name: "doi:_10.5281_zenodo.14210717" %% xsd:QName

What I found

Comparing my source example file to the copy the postprocessor writes under
build-local/tests/<register>/<block>/example_N_N.ttl (the file actually fed to the transform), one RDF value is encoded differently between the two:

• My source file (works):

  prov:specificEntity doi:_10.5281_zenodo.14210717 .
  

• The postprocessor's copy (fails):

  prov:specificEntity "doi:_10.5281_zenodo.14210717"^^xsd:QName ;
  

Both are valid Turtle, but the second form (an xsd:QName-typed literal) is not accepted by prov's deserializer, so my transform fails only when run through the postprocessor.

This suggests the postprocessor re-serializes/normalizes RDF examples at some point before running transforms against them, and that step changes this value's encoding. I haven't been able to find exactly where in the codebase this happens.

Question

• Does the postprocessor re-serialize or canonicalize text/turtle examples before passing them to transforms (e.g. for validation)?
• If so, could that be why the RDF encoding of a value changes between my source file and the copy used for the transform?

The source data for this example comes from https://github.com/opengeospatial/ogcapi-processes/blob/master/extensions/provenance/standard/examples/job_prov.json (Provenance extension), re-serialized to Turtle via prov. The exact transform script and example that reproduce this are in https://github.com/ogcincubator/bblocks-prov-jsonld-alt/pull/4 (draft PR, block w3c-prov-jsonld, transform w3c-prov-rdf-to-w3c-prov-jsonld, example w3c-prov-rdf/examples/example-ogcapi-processes-job.ttl).

Start by reproducing the linked PR's w3c-prov-rdf-to-w3c-prov-jsonld transform and compare the source Turtle with build-local/tests///example_N_N.ttl. Trace the postprocessor step that writes the build-local copy and determine whether it re-serializes the RDF before transforms run. Done means the encoding discrepancy is explained and the transform receives RDF it can deserialize successfully.