メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((129.8937500 32.6833333, 129.9000000 32.6833333, 129.9000000 32.6875000, 129.8937500 32.6875000, 129.8937500 32.6833333)) ^^http://www.opengis.net/ont/geosparql#wktLiteral