メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.360584974166 43.0933394393805, 141.360580192128 43.0933581803519, 141.360495255569 43.0937362363244, 141.359444628384 43.0935845946037, 141.359421933084 43.0935813230745, 141.358864859202 43.0935086975842, 141.359034681987 43.0928234083397, 141.359150372525 43.0923567686266, 141.359680013819 43.0924344533419, 141.360184563791 43.0925087763142, 141.360773006258 43.0925883211884, 141.360584974166 43.0933394393805)) ^^http://www.opengis.net/ont/geosparql#wktLiteral