メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((130.4625000 31.3833333, 130.4687500 31.3833333, 130.4687500 31.3875000, 130.4625000 31.3875000, 130.4625000 31.3833333)) ^^http://www.opengis.net/ont/geosparql#wktLiteral