メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.755932533313 43.1987830499286, 141.75559632019 43.1991224810121, 141.755314736835 43.1994162925672, 141.755060326419 43.1993031590514, 141.755002710248 43.1993511833392, 141.754335473776 43.1990199659368, 141.754678133608 43.1986520976578, 141.755004574345 43.1983090397453, 141.755932533313 43.1987830499286)) ^^http://www.opengis.net/ont/geosparql#wktLiteral