メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.394082344813 44.1830065247482, 142.393271167824 44.1828748525583, 142.393383295056 44.1825243435332, 142.393512995104 44.1821231847023, 142.394315365708 44.182258365754, 142.394082344813 44.1830065247482)) ^^http://www.opengis.net/ont/geosparql#wktLiteral