メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.145898329491 38.9260074291831, 141.145528022316 38.9264135302067, 141.145150713707 38.9268319663353, 141.14735041747 38.9280460643955, 141.147339389617 38.9280586224533, 141.14704763573 38.9283794262873, 141.146964772168 38.9284787446148, 141.14559019765 38.9277316690567, 141.144761338908 38.9272787253009, 141.143438868081 38.9265424656958, 141.142581765052 38.9260734647704, 141.14336729766 38.9252140761076, 141.143724476495 38.9248124499445, 141.144681365444 38.9253295287173, 141.145898329491 38.9260074291831)) ^^http://www.opengis.net/ont/geosparql#wktLiteral