メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((128.1750000 26.7208334, 128.1812500 26.7208334, 128.1812500 26.7250000, 128.1750000 26.7250000, 128.1750000 26.7208334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral