メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.911040736316 43.4830522975955, 141.909998053739 43.4832133062983, 141.909644290558 43.4820028084578, 141.910702537759 43.4818013060413, 141.911040736316 43.4830522975955)) ^^http://www.opengis.net/ont/geosparql#wktLiteral