メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.706159207968 44.3622843493286, 141.705213446012 44.3629073934772, 141.704883942944 44.3626570427985, 141.704556730704 44.3624083546876, 141.704279731468 44.362198825462, 141.704109419964 44.3620684876869, 141.705230714304 44.3613400825384, 141.705409264191 44.3614803710149, 141.705753037679 44.3617504413697, 141.706159207968 44.3622843493286)) ^^http://www.opengis.net/ont/geosparql#wktLiteral