メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.417896796195 43.8225407552269, 142.41627169176 43.8213795870149, 142.418740252796 43.819611829457, 142.420356683239 43.8207698282689, 142.41902764903 43.8217347757875, 142.417896796195 43.8225407552269)) ^^http://www.opengis.net/ont/geosparql#wktLiteral