メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.392991087372 44.1768168486327, 142.393738144657 44.1769328716188, 142.39366245183 44.1771849468313, 142.393519789335 44.1776600943533, 142.392758331959 44.1775425942654, 142.391873387243 44.1773985928644, 142.392110268088 44.1766728433081, 142.392991087372 44.1768168486327)) ^^http://www.opengis.net/ont/geosparql#wktLiteral