メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.7562500 39.7958334, 141.7625000 39.7958334, 141.7625000 39.8000000, 141.7562500 39.8000000, 141.7562500 39.7958334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral