メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((134.5937500 34.1000000, 134.6000000 34.1000000, 134.6000000 34.1041667, 134.5937500 34.1041667, 134.5937500 34.1000000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral