メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((135.9437500 35.0583333, 135.9500000 35.0583333, 135.9500000 35.0625000, 135.9437500 35.0625000, 135.9437500 35.0583333)) ^^http://www.opengis.net/ont/geosparql#wktLiteral