メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.345289436256 43.0275124568033, 141.345226042302 43.0280693239766, 141.344338025687 43.0279942893796, 141.343801751437 43.0279632474124, 141.343861259922 43.0274172518689, 141.343962507437 43.0266469481723, 141.344388392318 43.0266743731391, 141.345404645535 43.0267497189273, 141.345289436256 43.0275124568033)) ^^http://www.opengis.net/ont/geosparql#wktLiteral