メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((135.3687500 34.2958334, 135.3750000 34.2958334, 135.3750000 34.3000000, 135.3687500 34.3000000, 135.3687500 34.2958334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral