メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.340276959463 43.1072514064103, 141.340126416542 43.1076750589556, 141.339112141466 43.1075373557977, 141.338591213133 43.1074665968119, 141.338688557343 43.1070839461345, 141.338854500465 43.1064315715207, 141.340460509644 43.1064847445547, 141.340276959463 43.1072514064103)) ^^http://www.opengis.net/ont/geosparql#wktLiteral