Added functionality to display ontology classes and properties

[tdn]

Similar to concept schemes, ontologies (when properly served with isDefinedBy relations by a Prez Profile) will now display classes and properties on the ItemPage.

To achieve this, the following was added to prez-lib:

• SYSTEM_PREDICATES.owlOntology
• types PrezOntologyNodeand PrezConceptSchemeOntologyNode (for backwards compatibility when an ontology is both a skos:ConceptScheme and a owl:Ontology)
• functions getOntologyClasses and getOntologyProperties that leverage the isDefinedBy relation to get the necessary data
• added this functionality to getItem() so it's included in the data returned by prez-lib

To prez-ui:

• Listing of the classes and properties if the item is an ontology

To test this, include an owl:Ontology in your data, as well as a profile that serves the isDefinedBy relation. For example, use this config:

<https://prez.dev/profile/ontology-object>
    a prof:Profile, prez:ObjectProfile ;
    dcterms:identifier "ontology-object"^^xsd:token ;
    dcterms:description "An ontology." ;
    dcterms:title "Ontology profile" ;
    altr-ext:constrainsClass owl:Ontology ;
    altr-ext:hasDefaultResourceFormat "text/anot+turtle" ;
    altr-ext:hasResourceFormat
        "application/ld+json",
        "application/rdf+xml",
        "text/anot+turtle",
        "text/turtle" ;
    sh:property
    [
          sh:path
              [
                  sh:union (
                               [ shext:bNodeDepth "2" ]
                               shext:allPredicateValues
                               [
                                  sh:path [ sh:inversePath rdfs:isDefinedBy ] ;
                               ]
                               [
                                  sh:path ([ sh:inversePath rdfs:isDefinedBy ] rdf:type) ;
                               ]
                           )
              ]
      ] ;
.

(see https://github.com/Kurrawong/ogc-test-catalogue )

[jamiefeiss]

Looks good, thanks