メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((144.976678876601 43.5586502752803, 144.977130231004 43.5589454212233, 144.976406056123 43.5595123134971, 144.975963444732 43.5592181162725, 144.975466826404 43.5589098065095, 144.976201026576 43.5583378295454, 144.976678876601 43.5586502752803)) ^^http://www.opengis.net/ont/geosparql#wktLiteral