views.py 文件源码

def agent_lod(request, agent_id):
    agents = EconomicAgent.objects.filter(id=agent_id)
    if not agents:
        return HttpResponse({}, content_type='application/json')

    agent = agents[0]
    subject_assocs = agent.all_is_associates()
    object_assocs = agent.all_has_associates()

    from rdflib import Graph, Literal, BNode
    from rdflib.namespace import FOAF, RDF, RDFS, OWL, SKOS
    from rdflib.serializer import Serializer
    from rdflib import Namespace, URIRef

    path, instance_abbrv, context, store, vf_ns = get_lod_setup_items()

    #Lynn: I made a change here for consistency. Please check and fix if needed.
    ref = URIRef(instance_abbrv + ":agent-lod/" + str(agent.id) + "/")
    if agent.agent_type.name == "Individual" or agent.agent_type.name == "Person":
        store.add((ref, RDF.type, vf_ns.Person))
    #elif agent.agent_type.name == "Organization":
    #    store.add((ref, RDF.type, vf_ns.Organization))
    else:
        at_class_name = camelcase(agent.agent_type.name)
        ref_class = URIRef(instance_abbrv + ":agent-type-lod/" + at_class_name)
        store.add((ref, RDF.type, ref_class))
    store.add((ref, vf_ns["label"], Literal(agent.name, lang="en")))
    #if agent.photo_url:
    #    store.add((ref, vf_ns["image"], agent.photo_url))

    #if subject_assocs or object_assocs:
    #    store.add((  ))
    if subject_assocs:
        for a in subject_assocs:
            obj_ref = URIRef(instance_abbrv + ":agent-relationship-lod/" + str(a.id) + "/")
            property_name = camelcase_lower(a.association_type.label)
            ref_relationship = URIRef(instance_abbrv + ":agent-relationship-type-lod/" + property_name)
            store.add((ref, ref_relationship, obj_ref))
    if object_assocs:
        for a in object_assocs:
            subj_ref = URIRef(instance_abbrv + ":agent-relationship-inv-lod/" + str(a.id) + "/")
            inv_property_name = camelcase_lower(a.association_type.inverse_label)
            inv_ref_relationship = URIRef(instance_abbrv + ":agent-relationship-type-lod/" + inv_property_name)
            store.add((ref, inv_ref_relationship, subj_ref))

    ser = store.serialize(format='json-ld', context=context, indent=4)
    return HttpResponse(ser, content_type='application/json')  

#following method supplied by Niklas at rdflib-jsonld support to get the desired output for nested rdf inputs for rdflib