メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.366747687641 43.7634007778367, 142.367058407234 43.7639502493437, 142.365542071885 43.7643893790334, 142.365231356025 43.7638230610317, 142.36489738361 43.7632511750924, 142.366436909176 43.7628120302422, 142.366764123672 43.7633957852756, 142.366747687641 43.7634007778367)) ^^http://www.opengis.net/ont/geosparql#wktLiteral