メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.375552072566 43.0754734912712, 141.375423685549 43.0760350042814, 141.374617298964 43.0759352341548, 141.37470957945 43.0755856300644, 141.374761335859 43.075366668584, 141.374922000241 43.0748025194274, 141.375692625591 43.0749198074482, 141.375552072566 43.0754734912712)) ^^http://www.opengis.net/ont/geosparql#wktLiteral