メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.353439693726 43.7744172611597, 142.353657754499 43.7748422551264, 142.353664146151 43.7748546958968, 142.352242627342 43.7752625459798, 142.352234960477 43.7752480846372, 142.352012086913 43.7748274871081, 142.351857239564 43.7745381161069, 142.353296740674 43.7741209911183, 142.35330710681 43.7741389648194, 142.353439693726 43.7744172611597)) ^^http://www.opengis.net/ont/geosparql#wktLiteral