メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.364631717624 43.7691224097782, 142.364919828495 43.769650006452, 142.363358541747 43.7701044045717, 142.363066553051 43.7695722200102, 142.362769077734 43.7690300564734, 142.364331897337 43.7685734125113, 142.364631717624 43.7691224097782)) ^^http://www.opengis.net/ont/geosparql#wktLiteral