メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((134.8812500 34.3916667, 134.8875000 34.3916667, 134.8875000 34.3958334, 134.8812500 34.3958334, 134.8812500 34.3916667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral