メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.388048895278 44.164934177921, 142.388031951585 44.1649314728804, 142.385742884754 44.1645524105076, 142.385311923696 44.1631058641721, 142.388460675218 44.1636028438603, 142.388048895278 44.164934177921)) ^^http://www.opengis.net/ont/geosparql#wktLiteral