メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.347020695447 43.7748321547606, 142.347243626857 43.7752415125738, 142.345565388098 43.7757283500784, 142.345370126741 43.7753158173636, 142.345261015263 43.7753468513724, 142.345024261557 43.7749335619681, 142.346793054061 43.7744194600617, 142.347020695447 43.7748321547606)) ^^http://www.opengis.net/ont/geosparql#wktLiteral