メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.71070453128 44.3703100879441, 141.709681887619 44.3709692827667, 141.708586419796 44.3700982858664, 141.709612558327 44.3694476955695, 141.71070453128 44.3703100879441)) ^^http://www.opengis.net/ont/geosparql#wktLiteral