メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.4250000 39.5000000, 140.4312500 39.5000000, 140.4312500 39.5041667, 140.4250000 39.5041667, 140.4250000 39.5000000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral