メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((129.8812500 32.8041667, 129.8875000 32.8041667, 129.8875000 32.8083333, 129.8812500 32.8083333, 129.8812500 32.8041667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral