メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.912176887006 43.4841761474692, 141.911401063174 43.4842911187562, 141.911257097074 43.4838080882435, 141.911040736316 43.4830522975955, 141.911819032819 43.4829370529865, 141.911895727181 43.4832016314529, 141.912176887006 43.4841761474692)) ^^http://www.opengis.net/ont/geosparql#wktLiteral