メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((135.8937500 35.5583333, 135.9000000 35.5583333, 135.9000000 35.5625000, 135.8937500 35.5625000, 135.8937500 35.5583333)) ^^http://www.opengis.net/ont/geosparql#wktLiteral