メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.333216896914 43.7646652756599, 142.33395377298 43.7648987270752, 142.333321278597 43.7659680063218, 142.332877148254 43.7658342798013, 142.332607955875 43.7657467321318, 142.331787006247 43.7655108857404, 142.331862489423 43.7653731251945, 142.332434618553 43.7644208795334, 142.333216896914 43.7646652756599)) ^^http://www.opengis.net/ont/geosparql#wktLiteral