メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((136.2625000 34.8750000, 136.2687500 34.8750000, 136.2687500 34.8791667, 136.2625000 34.8791667, 136.2625000 34.8750000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral