メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.406944867952 44.1749326707061, 142.406108037022 44.1748052932851, 142.406535547696 44.1733521681173, 142.406677966597 44.1733747377344, 142.40677107797 44.1730558311397, 142.40747839631 44.173173521257, 142.407230457894 44.1740407919877, 142.406944867952 44.1749326707061)) ^^http://www.opengis.net/ont/geosparql#wktLiteral