メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.372077624528 43.0732395503388, 141.371249370371 43.0731224278083, 141.371408898775 43.0728881889064, 141.371473801289 43.0726227018828, 141.371439760846 43.0724134915356, 141.37166074154 43.0723900799494, 141.371779957466 43.0722308541153, 141.372346519307 43.0721580472694, 141.372077624528 43.0732395503388)) ^^http://www.opengis.net/ont/geosparql#wktLiteral