メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((135.6250000 33.6041667, 135.6312500 33.6041667, 135.6312500 33.6083333, 135.6250000 33.6083333, 135.6250000 33.6041667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral