メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.3250000 43.0791667, 141.3312500 43.0791667, 141.3312500 43.0833333, 141.3250000 43.0833333, 141.3250000 43.0791667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral