メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((144.103165805772 43.8218837575376, 144.102412969633 43.8221180286072, 144.101692460492 43.8223362301895, 144.100995086733 43.8211666446933, 144.101720275944 43.8209431329243, 144.102492793978 43.8207050833178, 144.103165805772 43.8218837575376)) ^^http://www.opengis.net/ont/geosparql#wktLiteral