メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.771423967078 43.1995813300263, 141.771859815058 43.1998105864015, 141.771446124942 43.2002413801129, 141.771253125902 43.2004469155975, 141.770814261243 43.2002275553807, 141.77025214163 43.1999429058187, 141.770861786152 43.1993051214521, 141.771423967078 43.1995813300263)) ^^http://www.opengis.net/ont/geosparql#wktLiteral