メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.521242611873 43.8574650131746, 141.521012853484 43.8578936358475, 141.51724619335 43.8569320801661, 141.517474333715 43.8564510761581, 141.521242611873 43.8574650131746)) ^^http://www.opengis.net/ont/geosparql#wktLiteral