http://prismstandard.org/namespaces/basic/2.0/publicationDate leaf node

@prefix dcterms: <http://purl.org/dc/terms/> .
@prefix owl: <http://www.w3.org/2002/07/owl#> .
@prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .
@prefix skos: <http://www.w3.org/2004/02/skos/core#> .
@prefix vann: <http://purl.org/vocab/vann/> .
@prefix vs: <http://www.w3.org/2003/06/sw-vocab-status/ns#> .
@prefix xsd: <http://www.w3.org/2001/XMLSchema#> .

<http://prismstandard.org/namespaces/basic/2.0/publicationDate> a owl:DatatypeProperty,
        owl:FunctionalProperty ;
    rdfs:label "has publication date"@en ;
    vann:example """
        :my-paperback a fabio:Paperback ;
            prism:publicationDate '2007-06'^^xsd:gYearMonth .
    """ ;
    rdfs:comment "The date on which a resource is published or disclosed."@en ;
    rdfs:domain <http://purl.org/vocab/frbr/core#Endeavour> ;
    rdfs:isDefinedBy <http://prismstandard.org/namespaces/basic/2.0/> ;
    rdfs:range [ a rdfs:Datatype ;
            owl:unionOf ( xsd:date xsd:gYear xsd:gYearMonth ) ] ;
    rdfs:subPropertyOf dcterms:issued ;
    vs:term_status <http://purl.org/linked-data/registry#statusStable> ;
    skos:note """
The date can be expressed in three different formats:
- yyyy-mm-dd (i.e., xsd:date)
- yyyy-mm (i.e., xsd:gYearMonth)
- yyyy (i.e., xsd:gYear)"""@en .