メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((129.9812500 33.3916667, 129.9875000 33.3916667, 129.9875000 33.3958334, 129.9812500 33.3958334, 129.9812500 33.3916667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral