メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.371297999575 43.1213058760433, 141.371088623116 43.1220560683071, 141.370338750566 43.1219372183898, 141.370432292594 43.1216334892813, 141.369785217492 43.1213697071572, 141.369853790965 43.1211133983176, 141.369965255411 43.1207181012386, 141.371406480971 43.1209171644302, 141.371297999575 43.1213058760433)) ^^http://www.opengis.net/ont/geosparql#wktLiteral