メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.351671740427 43.7581276643409, 142.350913914997 43.7587256506315, 142.349509747259 43.7597944944023, 142.347978283076 43.758756330745, 142.348563901199 43.7583001232805, 142.348704697808 43.7581904578025, 142.349542647196 43.7575376870064, 142.349684010446 43.7574275445493, 142.35011534847 43.7570967595442, 142.351671740427 43.7581276643409)) ^^http://www.opengis.net/ont/geosparql#wktLiteral