メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.713640520612 39.0820453570899, 141.713442078864 39.0824689766381, 141.712417645494 39.0821115237103, 141.712635616146 39.0817329401061, 141.71265152411 39.0817053728588, 141.71275326054 39.0815287345439, 141.7137287468 39.0818570661048, 141.713640520612 39.0820453570899)) ^^http://www.opengis.net/ont/geosparql#wktLiteral