メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.399744049097 44.1752848994526, 142.398492871852 44.1750868284051, 142.398841038924 44.1739340639368, 142.399069937574 44.1739687499454, 142.400105266567 44.1741255587478, 142.399744049097 44.1752848994526)) ^^http://www.opengis.net/ont/geosparql#wktLiteral