メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.350821654445 43.7552233751762, 142.351734064883 43.7558255428199, 142.35011534847 43.7570967595442, 142.349684010446 43.7574275445493, 142.349542647196 43.7575376870064, 142.348917063384 43.7571122845413, 142.348442009578 43.7567825604675, 142.348272200163 43.7566681200264, 142.347941123052 43.7564398826459, 142.348568390166 43.7559646338948, 142.348887368381 43.75572118477, 142.349375210565 43.7553394400179, 142.349664735878 43.7551368535126, 142.350144530116 43.7547648517328, 142.350821654445 43.7552233751762)) ^^http://www.opengis.net/ont/geosparql#wktLiteral