メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.347065441963 43.7691044388941, 142.347222009866 43.7690534267126, 142.348105699973 43.7706981089769, 142.346684640449 43.7710368655794, 142.346656361047 43.7709527328483, 142.346459609262 43.7706293351904, 142.345812929743 43.7694851959625, 142.345407334771 43.7691763196018, 142.34642625735 43.7683700645145, 142.346761996011 43.7685019088062, 142.347065441963 43.7691044388941)) ^^http://www.opengis.net/ont/geosparql#wktLiteral