メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((135.8000000 35.4541667, 135.8062500 35.4541667, 135.8062500 35.4583333, 135.8000000 35.4583333, 135.8000000 35.4541667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral