メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((135.4437500 35.0416667, 135.4500000 35.0416667, 135.4500000 35.0458334, 135.4437500 35.0458334, 135.4437500 35.0416667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral