メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((136.6937500 34.3583333, 136.7000000 34.3583333, 136.7000000 34.3625000, 136.6937500 34.3625000, 136.6937500 34.3583333)) ^^http://www.opengis.net/ont/geosparql#wktLiteral