メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.763226248851 43.2042801290291, 141.76290854715 43.2046323876979, 141.762681928153 43.2048886135443, 141.761728850641 43.2044113140619, 141.761990000235 43.2041593160846, 141.762285000744 43.2038454324326, 141.763226248851 43.2042801290291)) ^^http://www.opengis.net/ont/geosparql#wktLiteral