メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.397624975544 44.1860649045774, 142.397475778451 44.1860398362403, 142.397683387616 44.1852092408757, 142.398121587858 44.1852807485559, 142.398608475226 44.1853602071486, 142.397750073931 44.1859752658913, 142.397624975544 44.1860649045774)) ^^http://www.opengis.net/ont/geosparql#wktLiteral