メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.755008709195 43.1954646337089, 141.754978604969 43.1954489616571, 141.754339475476 43.1961378056368, 141.753378521499 43.1956555534029, 141.754032307414 43.1949736692946, 141.754708657231 43.1942513705795, 141.755663336836 43.1947532773557, 141.755008709195 43.1954646337089)) ^^http://www.opengis.net/ont/geosparql#wktLiteral