メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.339971144222 43.0897487952682, 141.339629054565 43.0911283111007, 141.338125546899 43.0909204609178, 141.338348525 43.0900430606912, 141.338472338313 43.0895496369086, 141.339206506097 43.0896476203604, 141.339971144222 43.0897487952682)) ^^http://www.opengis.net/ont/geosparql#wktLiteral