owlrl relies on OWL.Datatype which does not exist in the OWL namespace in rdflib

[jgeluk]

This line fails with rdflib 6.1.1 because the OWL namespace defined in rdflib does not support the OWL.Datatype property:

OWL-RL/owlrl/OWLRLExtras.py

Line 354 in a77e179

to_be_removed.add((OWL.DataRange, RDFS.subClassOf, OWL.Datatype))

[jgeluk]

See also https://github.com/RDFLib/rdflib/blob/55d6622a0a7657d8d36b909add96169ba9e6553d/rdflib/namespace/_OWL.py#L79

[jgeluk]

Workaround:

OWL._fail = False

[jgeluk]

Renamed OWL.Datatype to OWL.DatatypeProperty in this fork: https://github.com/EKGF/OWL-RL

[jjoao]

This looks a cut and paste like a typo:
OWL:Datatype should be RDFS:Datatype

[jjoao]

Renamed OWL.Datatype to OWL.DatatypeProperty in this fork: https://github.com/EKGF/OWL-RL

This is not ideal: you are adding "to be removes triple" like
to_be_removed.add((OWL.DataRange, OWL.equivalentClass, RDFS.Datatype))
That will never happens (and fail to remove some noise)
=> RDFS:Datatype

[jgeluk]

Alright, makes sense.

[majidaldo]

can this be merged asap? seems like a trivial fix.

[djherron]

I had the same issue. I agree with the assessment made by @jjoao . It looks like copy/paste typo errors in two lines in the method 'post_process(self)' of class OWLRL_Extension_Trimming. Consider these 3 lines of code:

    to_be_removed.add((RDFS.Datatype, OWL.equivalentClass, OWL.DataRange))
    to_be_removed.add((OWL.DataRange, RDFS.subClassOf, OWL.Datatype))
    to_be_removed.add((OWL.DataRange, OWL.equivalentClass, OWL.Datatype))

The first of these 3 lines refers to RDFS.Datatype, but the other two lines mistakenly refer to OWL.Datatype, which doesn't exist in the OWL namespace. So a fix involves changing OWL.Datatype to RDFS.Datatype in these two lines.

[majidaldo]

bump