メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((128.8125000 32.6916667, 128.8187500 32.6916667, 128.8187500 32.6958334, 128.8125000 32.6958334, 128.8125000 32.6916667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral