メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((135.4625000 34.5916667, 135.4687500 34.5916667, 135.4687500 34.5958334, 135.4625000 34.5958334, 135.4625000 34.5916667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral