メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((135.6187500 34.3791667, 135.6250000 34.3791667, 135.6250000 34.3833333, 135.6187500 34.3833333, 135.6187500 34.3791667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral