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BREAKING CHANGES:
- Update to new PRObs ontology URIs: `http://w3id.org/probs-lab/ontology#` and `http://w3id.org/probs-lab/process-recipe#`.
Fixes:
- Use rdflib version >= 6.2, <7.0 : This fixes turtle serialization errors for PNames that contain brackets, see [rdflib changelog](https://github.com/RDFLib/rdflib/blob/main/CHANGELOG.md#2022-07-16-release-620), pull request 1678).
- Include implementation of `preferredLabel` for compatibility (removed in rdflib versions greater than 6.1.1).