メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.330138778068 43.7547359307804, 142.330894574108 43.7549726814961, 142.330257596276 43.7560378251825, 142.329517210135 43.7557915655756, 142.328905094842 43.755608960505, 142.329528469679 43.7545421634303, 142.330138778068 43.7547359307804)) ^^http://www.opengis.net/ont/geosparql#wktLiteral