メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.776402294085 43.2021532720892, 141.775801896029 43.2027810028579, 141.774914363998 43.2023158382593, 141.775488385425 43.201693559541, 141.77595433943 43.2019248964624, 141.776356819629 43.2021287520315, 141.776402294085 43.2021532720892)) ^^http://www.opengis.net/ont/geosparql#wktLiteral