メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((143.046002807504 42.9055775325267, 143.046712358353 42.9056218351302, 143.046564417497 42.9069257859384, 143.045829009471 42.9068735722179, 143.045000196239 42.9068192558227, 143.045178233171 42.9055168587731, 143.046002807504 42.9055775325267)) ^^http://www.opengis.net/ont/geosparql#wktLiteral