メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((137.0937500 35.0958334, 137.1000000 35.0958334, 137.1000000 35.1000000, 137.0937500 35.1000000, 137.0937500 35.0958334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral