メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((129.9687500 32.9458334, 129.9750000 32.9458334, 129.9750000 32.9500000, 129.9687500 32.9500000, 129.9687500 32.9458334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral