メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((143.055214188474 42.9037151845732, 143.053135578684 42.9035534458078, 143.053231978047 42.9029099969323, 143.053242722941 42.9028386036985, 143.053269647767 42.9025769165189, 143.054431513271 42.9026561207497, 143.055214188474 42.9037151845732)) ^^http://www.opengis.net/ont/geosparql#wktLiteral