メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.862503950138 43.3394674345409, 141.862655549678 43.3400081253849, 141.861113817551 43.3402586828913, 141.86109762731 43.3402134776901, 141.860947871182 43.3397104168201, 141.860851973185 43.3393756191589, 141.860811003785 43.3392340530329, 141.862375796061 43.3390138163341, 141.862503950138 43.3394674345409)) ^^http://www.opengis.net/ont/geosparql#wktLiteral