メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.341889791105 43.0428204623458, 141.341882157418 43.0428569733509, 141.341857895048 43.0430522283828, 141.339908947217 43.0429272369251, 141.33991170137 43.042896595421, 141.339928002619 43.0427149213517, 141.339998959022 43.042241180462, 141.341939141465 43.0423674364246, 141.341889791105 43.0428204623458)) ^^http://www.opengis.net/ont/geosparql#wktLiteral