メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.377041273475 43.7534190030843, 142.375561371517 43.7538450893318, 142.374921958439 43.7526737363695, 142.376375778222 43.7522360319571, 142.377041273475 43.7534190030843)) ^^http://www.opengis.net/ont/geosparql#wktLiteral