メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.396020195352 44.1790536208928, 142.394534553617 44.1788163003065, 142.394831926472 44.1778645813199, 142.396301536646 44.1780935153329, 142.396020195352 44.1790536208928)) ^^http://www.opengis.net/ont/geosparql#wktLiteral