メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.379595100239 44.1726132838409, 142.377633114097 44.1723827652048, 142.377674725399 44.1721145837603, 142.37771768113 44.1716891360448, 142.379793225309 44.1719967516364, 142.379756499729 44.1721168423638, 142.379595100239 44.1726132838409)) ^^http://www.opengis.net/ont/geosparql#wktLiteral