3. ontology_examples_and_config.md¶

```markdown

RDF Ontology Examples & Configuration for flexible-graphrag¶

Example 1: FOAF (Friend-of-a-Friend) Ontology¶

File: schemas/foaf_ontology.ttl

```turtle @prefix foaf: http://xmlns.com/foaf/0.1/ . @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# .

Define classes (entity types)¶

foaf:Person a owl:Class ; rdfs:label "Person" ; rdfs:comment "A human being" .

foaf:Organization a owl:Class ; rdfs:label "Organization" ; rdfs:comment "A collective entity" .

foaf:Project a owl:Class ; rdfs:label "Project" ; rdfs:comment "A project or initiative" .

Define properties (relation types)¶

foaf:name a owl:DatatypeProperty ; rdfs:domain foaf:Person ; rdfs:range rdfs:Literal ; rdfs:label "name" .

foaf:workplaceHomepage a owl:ObjectProperty ; rdfs:domain foaf:Person ; rdfs:range foaf:Organization ; rdfs:label "workplaceHomepage" ; rdfs:comment "Person works at Organization" .

foaf:knows a owl:ObjectProperty ; rdfs:domain foaf:Person ; rdfs:range foaf:Person ; rdfs:label "knows" .

foaf:topic_interest a owl:ObjectProperty ; rdfs:domain foaf:Person ; rdfs:range foaf:Project ; rdfs:label "topic_interest" .

foaf:member a owl:ObjectProperty ; rdfs:domain foaf:Person ; rdfs:range foaf:Organization ; rdfs:label "member" .