メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((135.2312500 34.6916667, 135.2375000 34.6916667, 135.2375000 34.6958334, 135.2312500 34.6958334, 135.2312500 34.6916667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral