メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.393861040585 44.1844665851248, 142.394712715771 44.1846011719571, 142.394330619216 44.1857815959235, 142.393497272135 44.1856563693444, 142.392433566588 44.1854937519304, 142.392587187839 44.1850134070898, 142.392813492498 44.1843057778433, 142.393861040585 44.1844665851248)) ^^http://www.opengis.net/ont/geosparql#wktLiteral