メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.9812500 38.6500000, 140.9875000 38.6500000, 140.9875000 38.6541667, 140.9812500 38.6541667, 140.9812500 38.6500000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral