メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((143.7562500 43.7500000, 143.7625000 43.7500000, 143.7625000 43.7541667, 143.7562500 43.7541667, 143.7562500 43.7500000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral