メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.922394721434 43.5377376134486, 141.92078421192 43.5379596268899, 141.92051114341 43.5370886854235, 141.920296031832 43.5363151667989, 141.92135001678 43.5361245527368, 141.921285683832 43.535943177079, 141.921864744631 43.5358433536675, 141.922428531137 43.5377329975948, 141.922394721434 43.5377376134486)) ^^http://www.opengis.net/ont/geosparql#wktLiteral