メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.340410049426 43.0555858628668, 141.340255383578 43.0561481126494, 141.340193412246 43.0564085425382, 141.340116503715 43.0567321496724, 141.339036326318 43.0565811326147, 141.338577349115 43.0565205087006, 141.338659841344 43.0561930186967, 141.338723474869 43.0559403997914, 141.338881789328 43.0553787431404, 141.340410049426 43.0555858628668)) ^^http://www.opengis.net/ont/geosparql#wktLiteral