メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.75667074808 43.1930102479785, 141.757120423208 43.1932287235451, 141.75702638501 43.1933403512525, 141.75677453978 43.1936042630416, 141.756323080637 43.1940491823019, 141.756352662345 43.1940640091019, 141.755663336836 43.1947532773557, 141.754708657231 43.1942513705795, 141.755369457022 43.1935536876015, 141.75614539658 43.1927421449296, 141.75667074808 43.1930102479785)) ^^http://www.opengis.net/ont/geosparql#wktLiteral