Check out how to get version of ontology

[francescalb]

Currently get_ontology of emmo-inferred (latest-stable) fails as versionIRI is missing.
Look into how to make better error message and perhaps infer from other tags if versionIRI is missing.

Also ontoversion fails and must be checked.

[francescalb]

There is already a sufficient error message in ontology.get_version(), which is:
TypeError: No versionIRI in Ontology

Inferring from other tags I think is a bad idea as this will open up for mistakes that are difficult to track later.

The default version in ontoversion should be ttl, and it would be nice to have a better error message here, that suggests including format.

[CasperWA]

Determine whether versionInfo or versionIRI should be the higher source of truth. And at least use both to try and determine the version.

[francescalb]

@jesper-friis

I want to add the possibility of getting the version from the versionInfo as well as from the versionIRI. Which one do you think should have precedence?

[jesper-friis]

Since the semantics of owl:versionInfo is not well defined on https://www.w3.org/TR/owl-ref/#versionInfo-def, I think versionIRI should have precedence.

However, on https://www.w3.org/TR/2004/REC-owl-guide-20040210/#OntologyVersioning they indicate that owl:versionInfo can be used by versioning systems. So good practice is probably to set owl:versionInfo to the version number (without any prepended "v").

[francescalb]

OK, from the above discussion I propose to do as follows:

if as_iri:
     return VersionIRI of versionIRI else Exception versionIRImissing
else:
    if version_iri:
        return version inferred from version_iri and base_iri
    elif versionInfo:
         return versionINFO
    else:
        raise NoVersionInfoFound....

I guess, then the only reason make this change is to find version from versionInfo if the ontology is malformed and does not have versionIRI (which it should have). Comments?

[francescalb]

@jesper-friis , you were quick on approving the draft, can you please comment on this?