メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((128.8312500 32.6833333, 128.8375000 32.6833333, 128.8375000 32.6875000, 128.8312500 32.6875000, 128.8312500 32.6833333)) ^^http://www.opengis.net/ont/geosparql#wktLiteral