メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((130.6062500 31.6833333, 130.6125000 31.6833333, 130.6125000 31.6875000, 130.6062500 31.6875000, 130.6062500 31.6833333)) ^^http://www.opengis.net/ont/geosparql#wktLiteral