メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.4562500 40.7916667, 140.4625000 40.7916667, 140.4625000 40.7958334, 140.4562500 40.7958334, 140.4562500 40.7916667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral