Multiple skos:notations for a skos:concept

[ajtucker]

SKOS allows multiple notations for a concept, but https://github.com/Swirrl/pmd-rdf-validations/blob/master/pmd4/src/swirrl/validations/pmd4/SELECT_ConceptMaxOneNotation.sparql restricts to just one notation.

We want to be able to re-use existing SKOS concept schemes without necessarily having to change them. Can we relax this constraint and have PMD deal with multiple possible notations per concept?

[ajtucker]

@Robsteranium reminded me that SKOS recommends using datatype literals for notations. We could relax the constraint to have max one notation per datatype.

[Robsteranium]

I think we're generally open to adopting more of the SKOS spec, relaxing the validation as proposed. Before we do that we ought to figure out exactly how we're going to present multiple notations on the UI. I suggest we discuss that in Swirrl/cogs-issues#271.