メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.7125000 43.3416667, 141.7187500 43.3416667, 141.7187500 43.3458334, 141.7125000 43.3458334, 141.7125000 43.3416667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral