メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((143.03441462301 42.9159799353821, 143.032322589442 42.9158378060573, 143.032532292511 42.9146514199561, 143.033351039394 42.9147155288925, 143.034564720346 42.9148084420577, 143.034562020168 42.9148294192726, 143.03441462301 42.9159799353821)) ^^http://www.opengis.net/ont/geosparql#wktLiteral