メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((129.9812500 32.8833333, 129.9875000 32.8833333, 129.9875000 32.8875000, 129.9812500 32.8875000, 129.9812500 32.8833333)) ^^http://www.opengis.net/ont/geosparql#wktLiteral