メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((144.986901967393 43.5556286133931, 144.986318912932 43.5561319284729, 144.985458113147 43.5556737476135, 144.985989280024 43.555134869382, 144.986448590508 43.5553832355292, 144.986469605245 43.5553946508999, 144.986901967393 43.5556286133931)) ^^http://www.opengis.net/ont/geosparql#wktLiteral