メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((143.131512936876 42.6960709757354, 143.13029519917 42.6965496004028, 143.130247627956 42.6964828672071, 143.129609344951 42.6955782066444, 143.130827357335 42.6951132316352, 143.131463819394 42.6960028486959, 143.131477244035 42.6960215945551, 143.131512936876 42.6960709757354)) ^^http://www.opengis.net/ont/geosparql#wktLiteral