メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((137.039709000324 34.9795870596107, 137.039478284469 34.9791765123687, 137.039406990097 34.9790397390157, 137.039545864178 34.9789896686107, 137.040716910899 34.9785192264599, 137.040784036633 34.9786404300279, 137.041003244552 34.9790119465893, 137.039709000324 34.9795870596107)) ^^http://www.opengis.net/ont/geosparql#wktLiteral