@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/Milestone> a owl:Class ;
    rdfs:label "Milestone" ;
    skos:definition "Lifecycle event marking a significant point or stage in the progression of a property transaction, occurring either at a single instant or over a bounded interval." ;
    rdfs:comment "Transaction lifecycle milestone. UFO Event particular; PROV-O Activity. Hybrid PROV-O typing per S007 Q2: instant milestones (instruction, offerAccepted, exchange) carry prov:atTime; interval milestones (completion-process, registration-process) carry prov:startedAtTime + prov:endedAtTime per Moreau W3C-grade discipline. Each Milestone Activity may pair with a prov:Plan carrying opda:plannedAtTime for expected-vs-actual variance (S007 Q6 Plan-vs-Activity reification)." ;
    skos:scopeNote "UFO: Event particular (Guizzardi 2005 Ch. 4 §4.7). DOLCE: Achievement (instant) or Accomplishment (interval) per Masolo et al. 2003 D18 §4.4. PROV-O: Activity (W3C PROV-O REC §3.2)." ;
    dct:source <https://opda.org.uk/pdtf/harness/odr/ODR-0007/section-Q2> .

# one hop — immediate neighbours
<https://opda.org.uk/pdtf/partOfTransaction> rdfs:label "part of transaction" .