メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((129.6937500 28.4833333, 129.7000000 28.4833333, 129.7000000 28.4875000, 129.6937500 28.4875000, 129.6937500 28.4833333)) ^^http://www.opengis.net/ont/geosparql#wktLiteral