VocPub SHACL warning for schema.license

[leskneebone]

VocPub 5.1 SHACL validator shows the following warning for "testLicenseWarning.ttl" attached:

For https://linked.data.gov.au/def/data-roles:

Requirement 2.1.13 Any licence pertaining to the reuse of a vocabulary's content SHOULD be given using the schema:license predicate preferentially indicating the IRI of a license if in RDF form or a literal URL (datatype xsd:anyURI) if online but not in RDF form. If the licence is expressed in test, a literal text field may be indicated

a bit of testing indicates that the warning is probably because the Creative Commons license is stated as a literal, not as an IRI. The warning goes away when changing it to an IRI reference. It probably should be stated as an IRI - but that's not the problem here - the requirement allows either IRI, literal or a "text field".(VocPub could probably suggest which text field property - also another matter).

So perhaps ignoring the text field issue for now, propose updating the SHACL to accept literal values with datatype xsd:anyURI for schema.license without warning.

testLicenseWarning.ttl.zip

[leskneebone]

Worked out the problem. The current nodeShape includes syntactically valid but confusing constraints:

<Requirement-2.1.13>
	a sh:NodeShape ;
	sh:targetClass skos:ConceptScheme ;
    sh:property [
        sh:message "Requirement 2.1.13 Any licence pertaining to the reuse of a vocabulary's content SHOULD be given using the schema:license predicate preferentially indicating the IRI of a license if in RDF form or a literal URL (datatype xsd:anyURI) if online but not in RDF form. If the licence is expressed in text, a literal text field may be indicated" ;
        sh:path schema:license ;
        sh:nodeKind sh:IRI ;
        sh:or (
            [ sh:nodeKind sh:IRI ]
            [ sh:datatype xsd:anyURI ]
            [ sh:datatype xsd:string ]
        ) ;
        sh:severity sh:Warning ;
    ] ;
.

Fix: remove sh:nodeKind sh:IRI ; which sits both outside and within the sh:or (remove the outside instance).

<Requirement-2.1.13>
	a sh:NodeShape ;
	sh:targetClass skos:ConceptScheme ;
    sh:property [
        sh:message "Requirement 2.1.13 Any licence pertaining to the reuse of a vocabulary's content SHOULD be given using the schema:license predicate preferentially indicating the IRI of a license if in RDF form or a literal URL (datatype xsd:anyURI) if online but not in RDF form. If the licence is expressed in text, a literal text field may be indicated" ;
        sh:path schema:license ;
        sh:or (
            [ sh:nodeKind sh:IRI ]
            [ sh:datatype xsd:anyURI ]
            [ sh:datatype xsd:string ]
        ) ;
        sh:severity sh:Warning ;
    ] ;
.