メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.6437500 40.2958334, 141.6500000 40.2958334, 141.6500000 40.3000000, 141.6437500 40.3000000, 141.6437500 40.2958334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral