メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.863928408545 43.3372056092785, 141.863150518389 43.3373321095501, 141.862633152653 43.3374213660239, 141.862383436942 43.3365732275672, 141.86289932762 43.3364879050177, 141.862906054718 43.3364868024796, 141.862882803922 43.3363883369392, 141.863594922736 43.3362818000996, 141.863707038685 43.3365977336625, 141.863928408545 43.3372056092785)) ^^http://www.opengis.net/ont/geosparql#wktLiteral