メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.6687500 38.2541667, 140.6750000 38.2541667, 140.6750000 38.2583333, 140.6687500 38.2583333, 140.6687500 38.2541667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral