メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.3250000 38.8583333, 141.3312500 38.8583333, 141.3312500 38.8625000, 141.3250000 38.8625000, 141.3250000 38.8583333)) ^^http://www.opengis.net/ont/geosparql#wktLiteral