メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.2937500 40.2541667, 141.3000000 40.2541667, 141.3000000 40.2583333, 141.2937500 40.2583333, 141.2937500 40.2541667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral