メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((144.417793659935 43.0078074437288, 144.41754304361 43.0079017868365, 144.417069946858 43.0074306145314, 144.415615546795 43.0059819498898, 144.416599295222 43.0051442259608, 144.417012749333 43.0060613553034, 144.417793659935 43.0078074437288)) ^^http://www.opengis.net/ont/geosparql#wktLiteral