メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.65190282511 42.8188658105136, 141.651927381457 42.8188755042036, 141.652687148994 42.8191731849767, 141.653282925532 42.8194020635269, 141.653396340872 42.8194456985343, 141.65258156101 42.8203948835192, 141.651907491075 42.8200759868178, 141.65113378343 42.8197221025275, 141.650435504349 42.8193790164009, 141.651164997008 42.8186021398101, 141.65190282511 42.8188658105136)) ^^http://www.opengis.net/ont/geosparql#wktLiteral