isDefinedBy not being properly recognized for data property

[inaja]

In the PECO ontology (https://w3id.org/peco)
The data property http://qudt.org/schema/qudt/value has rdfs:isDefinedBy "https://qudt.org/schema/qudt/". But the generated widco file shows: is defined by https://w3id.org/peco#

[dgarijo]

Duplicate with #587

[dgarijo]

This only happens when rdfs:isDefinedBy points to a literal. According to https://www.w3.org/TR/rdf12-schema/#ch_isdefinedby, the range of isDefinedBy should be a rdfs:Resource. In this case, the ontology annotation is wrong

[dgarijo]

I added a fix so if the value is not a resource, then do not complete with the ontology name by default