メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.903129536967 43.4626716087775, 141.905742666933 43.4622584667478, 141.906204342646 43.4638657692453, 141.903618678499 43.4642553773032, 141.902806661241 43.4643834501171, 141.902570921479 43.4635763304553, 141.902336726984 43.462774454638, 141.903129536967 43.4626716087775)) ^^http://www.opengis.net/ont/geosparql#wktLiteral