メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((135.6937500 34.8000000, 135.7000000 34.8000000, 135.7000000 34.8041667, 135.6937500 34.8041667, 135.6937500 34.8000000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral