メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.329135967616 43.0650618904271, 141.329919672812 43.0651753839169, 141.329808211959 43.0656431593941, 141.329784028201 43.0657272192726, 141.32972527211 43.065980634288, 141.32968210447 43.0661665885554, 141.329650522052 43.0663027723703, 141.328834632153 43.0661788916812, 141.328109211937 43.0660735276431, 141.328248856796 43.0655501395512, 141.328392402606 43.0649584222647, 141.329135967616 43.0650618904271)) ^^http://www.opengis.net/ont/geosparql#wktLiteral