メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((134.5625000 34.1166667, 134.5687500 34.1166667, 134.5687500 34.1208334, 134.5625000 34.1208334, 134.5625000 34.1166667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral