メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.421254895874 43.8249620902304, 142.419784073953 43.8260259913714, 142.419052302446 43.8265472057731, 142.418970795387 43.826490333012, 142.418648457503 43.8267153450098, 142.417966292818 43.8261975880436, 142.417038825446 43.8255607650938, 142.419592441663 43.8237366700827, 142.42007860408 43.8241139682322, 142.421254895874 43.8249620902304)) ^^http://www.opengis.net/ont/geosparql#wktLiteral