メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.408000931232 43.7894237115407, 142.40852639312 43.7897434308668, 142.409031297685 43.7900631773623, 142.40806652533 43.7908917011699, 142.407010454938 43.7902559716954, 142.406526228725 43.789969733412, 142.405938902451 43.7895979090816, 142.40695253762 43.7887674897975, 142.407496038065 43.7891076890027, 142.408000931232 43.7894237115407)) ^^http://www.opengis.net/ont/geosparql#wktLiteral