メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((143.054431513271 42.9026561207497, 143.053269647767 42.9025769165189, 143.053296567178 42.9023146658768, 143.053366677105 42.9017760545123, 143.053433480512 42.9013882609082, 143.05371040524 42.9016803121618, 143.054431513271 42.9026561207497)) ^^http://www.opengis.net/ont/geosparql#wktLiteral