メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((144.95606941692 43.5448138368561, 144.955590323914 43.5444774589765, 144.956224207767 43.5439703555579, 144.956717974816 43.5442976648778, 144.95606941692 43.5448138368561)) ^^http://www.opengis.net/ont/geosparql#wktLiteral