gr:hasMPN leaf node

@prefix gr: <http://purl.org/goodrelations/v1#> .
@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 xsd: <http://www.w3.org/2001/XMLSchema#> .

gr:hasMPN a owl:DatatypeProperty ;
    rdfs:label "has MPN (0..*)"@en ;
    rdfs:comment """The Manufacturer Part Number or MPN is a unique identifier for a product, service, or bundle from the perspective of a particular manufacturer. MPNs can be assigned to products or product datasheets, or bundles. Accordingly, the domain of this property is the union of gr:ProductOrService (the common superclass of goods and datasheets), and gr:Offering.

Important: Be careful when assuming two products or services instances or offering instances to be identical based on the MPN. Since MPNs are unique only for the same gr:BusinessEntity, this holds only when the two MPN values refer to the same gr:BusinessEntity. Such can be done by taking into account the provenance of the data. 

Usually, the properties gr:hasEAN_UCC-13 and gr:hasGTIN-14 are much more reliable identifiers, because they are globally unique.

See also http://en.wikipedia.org/wiki/Part_number"""@en ;
    rdfs:domain [ a owl:Class ;
            owl:unionOf ( gr:Offering gr:ProductOrService <http://schema.org/Product> ) ] ;
    rdfs:isDefinedBy <http://purl.org/goodrelations/v1> ;
    rdfs:range xsd:string ;
    rdfs:subPropertyOf <http://schema.org/productID> .