メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.572953356484 42.9815026666587, 141.573596306878 42.9813837355198, 141.573922971157 42.9822260591368, 141.574020067612 42.9825137263584, 141.572884822429 42.9827254028668, 141.571784525081 42.9829508490181, 141.571656643178 42.9825758562498, 141.571527045833 42.9822045810628, 141.571394150898 42.9818283626978, 141.571973628138 42.9817067428796, 141.572953356484 42.9815026666587)) ^^http://www.opengis.net/ont/geosparql#wktLiteral