メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((145.584846712418 43.3353023355699, 145.584471131911 43.3357899164964, 145.584100612246 43.3362644782693, 145.582773126862 43.3357096436102, 145.583154259596 43.3352176880201, 145.583530317192 43.3347386770326, 145.584846712418 43.3353023355699)) ^^http://www.opengis.net/ont/geosparql#wktLiteral