メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.779206250225 43.2119421026753, 141.779424526348 43.2120406162282, 141.780275988638 43.2124739599403, 141.779528422495 43.2132596296363, 141.779343347986 43.2131505635796, 141.778011082545 43.2124476300418, 141.778680674862 43.211699980402, 141.779206250225 43.2119421026753)) ^^http://www.opengis.net/ont/geosparql#wktLiteral