メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.3687500 41.1541667, 141.3750000 41.1541667, 141.3750000 41.1583333, 141.3687500 41.1583333, 141.3687500 41.1541667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral