メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.9750000 42.7416667, 142.9812500 42.7416667, 142.9812500 42.7458334, 142.9750000 42.7458334, 142.9750000 42.7416667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral