uco-co:firstItem-subjects-previousItem-shape leaf node

@prefix co: <http://purl.org/co/> .
@prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
@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-previousItem-shape a sh:PropertyShape ;
    sh:description "The first item in a list must not have a previous item."@en ;
    sh:maxCount 0 ;
    sh:path ( co:firstItem co:previousItem ) ;
    sh:targetSubjectsOf co:firstItem .