メタデータ名 unitMeasure-kilometer
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((138.1312500 34.8333333, 138.1375000 34.8333333, 138.1375000 34.8375000, 138.1312500 34.8375000, 138.1312500 34.8333333)) ^^http://www.opengis.net/ont/geosparql#wktLiteral