uco-co:firstItem-subjects-shape leaf node

@prefix co: <http://purl.org/co/> .
@prefix sh: <http://www.w3.org/ns/shacl#> .
@prefix uco-co: <https://ontology.unifiedcyberontology.org/co/> .
@prefix xsd: <http://www.w3.org/2001/XMLSchema#> .

uco-co:firstItem-subjects-shape a sh:PropertyShape ;
    sh:class co:ListItem ;
    sh:maxCount 1 ;
    sh:nodeKind sh:BlankNodeOrIRI ;
    sh:path co:firstItem ;
    sh:targetSubjectsOf co:firstItem .