メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.753788675712 43.1996035857847, 141.753503244686 43.1999081352521, 141.752602353777 43.1994216337226, 141.753131692874 43.1988535011744, 141.75404003576 43.1993274396957, 141.753791162503 43.199600852747, 141.753788675712 43.1996035857847)) ^^http://www.opengis.net/ont/geosparql#wktLiteral