メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((136.7437500 34.2916667, 136.7500000 34.2916667, 136.7500000 34.2958334, 136.7437500 34.2958334, 136.7437500 34.2916667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral