var D2R_namespacePrefixes = {
    rdf: 'http://www.w3.org/1999/02/22-rdf-syntax-ns#',
    rdfs: 'http://www.w3.org/2000/01/rdf-schema#',
    owl: 'http://www.w3.org/2002/07/owl#',
    dc: 'http://purl.org/dc/elements/1.1/',
    dcterms: 'http://purl.org/dc/terms/',
    foaf: 'http://xmlns.com/foaf/0.1/',
    tl: 'http://purl.org/NET/c4dm/timeline.owl#',
    ev: 'http://purl.org/NET/c4dm/event.owl#',
    sim: 'http://purl.org/ontology/similarity/',
    mo: 'http://purl.org/ontology/mo/',
    vamp: 'http://purl.org/ontology/vamp/',
    af: 'http://purl.org/ontology/af/',
    ov: 'http://open.vocab.org/terms/',
    xsd: 'http://www.w3.org/2001/XMLSchema#',
};