@prefix dc: <http://purl.org/dc/elements/1.1/> .
@prefix skos: <http://www.w3.org/2004/02/skos/core#> .
@prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
@prefix xsd: <http://www.w3.org/2001/XMLSchema#> .
@prefix seh: <http://example.com/seh#> .
@prefix set: <http://example.com/set#> .
@prefix ex: <http://example.com/data#> .

# A base class for requirements.
<http://example.com/set#Requirement>
  rdf:type skos:Concept ;
  skos:definition "A top-level requirement" ;
  skos:narrower ex:Requirement_1 .

# A example requirement.
<http://example.com/data#Requirement_1>
  skos:broader set:Requirement ;
  skos:prefLabel "Requirement 1" ;
  skos:definition "Write a provided error message to a log file." ;
  set:lastValidatedAt "2006-03-23"^^xsd:date ;
  set:lastModifiedAt "2006-03-20"^^xsd:date ;
  set:encodedBy ex:Class_C ;
  set:entryPoint ex:Method_C1 .

# A simple class collaboration graph.
<http://example.com/data#Class_C>
  seh:implements ex:Interface_B ;
  seh:extends ex:Class_A ;
  seh:contains ex:Method_C1 .

<http://example.com/data#Class_D>
  seh:contains ex:Method_D1 ;
  seh:contains ex:Method_D2 .

<http://example.com/data#Method_C1>
  seh:uses ex:Method_D2 .