メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.907754995931 43.4935449862441, 141.906909788094 43.4936591657656, 141.906574459036 43.4924611369196, 141.906512946133 43.4921947314658, 141.906806972505 43.4921401607108, 141.907128116377 43.4920471993041, 141.907286760611 43.491997846755, 141.907662815775 43.493251520054, 141.907754995931 43.4935449862441)) ^^http://www.opengis.net/ont/geosparql#wktLiteral