メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.837260198736 43.0751503657429, 142.836686223288 43.0750924085163, 142.836498576391 43.0750831038605, 142.836310223999 43.0750049485559, 142.835630384555 43.0746797814167, 142.836392478507 43.0728354683325, 142.838004972232 43.0731946582984, 142.837260198736 43.0751503657429)) ^^http://www.opengis.net/ont/geosparql#wktLiteral