メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.4562500 37.1958334, 140.4625000 37.1958334, 140.4625000 37.2000000, 140.4562500 37.2000000, 140.4562500 37.1958334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral