メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.892921110342 43.0167269180625, 142.892626435068 43.0165336863617, 142.892240549755 43.0163021418227, 142.892703621006 43.0158893863933, 142.893343719404 43.0162757755436, 142.893321199035 43.016312754982, 142.892989189725 43.0166563473821, 142.892921110342 43.0167269180625)) ^^http://www.opengis.net/ont/geosparql#wktLiteral