メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((129.4312500 28.3791667, 129.4375000 28.3791667, 129.4375000 28.3833333, 129.4312500 28.3833333, 129.4312500 28.3791667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral