メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.406108037022 44.1748052932851, 142.405568924212 44.1747269026365, 142.406101639771 44.1729452062278, 142.406629647662 44.1730322936163, 142.40677107797 44.1730558311397, 142.406677966597 44.1733747377344, 142.406535547696 44.1733521681173, 142.406108037022 44.1748052932851)) ^^http://www.opengis.net/ont/geosparql#wktLiteral