メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((135.9000000 35.5666667, 135.9062500 35.5666667, 135.9062500 35.5708334, 135.9000000 35.5708334, 135.9000000 35.5666667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral