メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((129.7812500 32.6041667, 129.7875000 32.6041667, 129.7875000 32.6083333, 129.7812500 32.6083333, 129.7812500 32.6041667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral