メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((134.9250000 34.4916667, 134.9312500 34.4916667, 134.9312500 34.4958334, 134.9250000 34.4958334, 134.9250000 34.4916667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral