メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((128.7812500 32.6458334, 128.7875000 32.6458334, 128.7875000 32.6500000, 128.7812500 32.6500000, 128.7812500 32.6458334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral