メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.0250000 39.6833333, 141.0312500 39.6833333, 141.0312500 39.6875000, 141.0250000 39.6875000, 141.0250000 39.6833333)) ^^http://www.opengis.net/ont/geosparql#wktLiteral