メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.901185668818 43.4819610608697, 141.901141576066 43.4819703508369, 141.90083978878 43.4808431829692, 141.901524331393 43.4807396318604, 141.90186501045 43.4818612544876, 141.901185668818 43.4819610608697)) ^^http://www.opengis.net/ont/geosparql#wktLiteral