メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.449407783809 43.0472754677045, 141.449568337748 43.047771157258, 141.447487692354 43.0481246311663, 141.447343514574 43.0476391117817, 141.447202776282 43.0472099512424, 141.448118884568 43.0470589718671, 141.449269654884 43.0468584948025, 141.449407783809 43.0472754677045)) ^^http://www.opengis.net/ont/geosparql#wktLiteral