ref:BACnetReferenceShape leaf node

@prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
@prefix ref: <https://brickschema.org/schema/Brick/ref#> .
@prefix sh: <http://www.w3.org/ns/shacl#> .
@prefix skos: <http://www.w3.org/2004/02/skos/core#> .

ref:BACnetReferenceShape a sh:NodeShape ;
    skos:definition "Infers a BACnetReference instance from the object of an hasExternalReference." ;
    sh:rule [ a sh:TripleRule ;
            sh:condition ref:BACnetReference ;
            sh:object ref:BACnetReference ;
            sh:predicate rdf:type ;
            sh:subject sh:this ] ;
    sh:targetObjectsOf ref:hasExternalReference .