メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((135.7562500 35.0166667, 135.7625000 35.0166667, 135.7625000 35.0208334, 135.7562500 35.0208334, 135.7562500 35.0166667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral