@prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .
@prefix owl: <http://www.w3.org/2002/07/owl#> .
@prefix skos: <http://www.w3.org/2004/02/skos/core#> .
@prefix sh: <http://www.w3.org/ns/shacl#> .
@prefix dct: <http://purl.org/dc/terms/> .
@prefix xsd: <http://www.w3.org/2001/XMLSchema#> .

<https://opda.org.uk/pdtf/hasEPCCertificate> a owl:ObjectProperty ;
    rdfs:label "has EPC certificate" ;
    skos:definition "Relates a Property to the Energy Performance Certificate issued for it: a distinct certificate entity in the DESNZ register with its own ten-year lifecycle, reached separately from the property's own current energy rating." ;
    rdfs:comment "Property → opda:EPCCertificate join predicate. The energy rating band stays on the Property as opda:currentEnergyRating (its rdfs:domain); this join reaches the certificate Entity as a distinct PROV-O artefact (10-year lifecycle, DESNZ register)." ;
    rdfs:domain <https://opda.org.uk/pdtf/Property> ;
    rdfs:range <https://opda.org.uk/pdtf/EPCCertificate> ;
    dct:source <https://opda.org.uk/pdtf/harness/data-dictionary/propertyPack.energyEfficiency.certificate> .

# one hop — immediate neighbours
<https://opda.org.uk/pdtf/Property> a owl:Class .