メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.338902451292 43.7751321544836, 142.339488033771 43.7754198491959, 142.339402939985 43.7755104911398, 142.338560865156 43.7764291534903, 142.33795215212 43.7761315215231, 142.337801638424 43.7760427890661, 142.337339375323 43.7757992745261, 142.33832252129 43.7748238656801, 142.338902451292 43.7751321544836)) ^^http://www.opengis.net/ont/geosparql#wktLiteral