メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.71276335748 44.3689500695892, 141.711750002905 44.3696066557181, 141.710688854012 44.3687497983955, 141.711170401932 44.3684494453759, 141.711675835202 44.3681254011586, 141.71276335748 44.3689500695892)) ^^http://www.opengis.net/ont/geosparql#wktLiteral