メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.7062500 44.2583333, 141.7125000 44.2583333, 141.7125000 44.2625000, 141.7062500 44.2625000, 141.7062500 44.2583333)) ^^http://www.opengis.net/ont/geosparql#wktLiteral