メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((135.2937500 34.9541667, 135.3000000 34.9541667, 135.3000000 34.9583333, 135.2937500 34.9583333, 135.2937500 34.9541667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral