メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.342823071303 43.7718956688071, 142.342437532155 43.7716765483843, 142.342175146736 43.7711922317909, 142.343187353236 43.7708999669104, 142.343393914146 43.771308838443, 142.342823071303 43.7718956688071)) ^^http://www.opengis.net/ont/geosparql#wktLiteral