メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((129.8937500 32.7166667, 129.9000000 32.7166667, 129.9000000 32.7208334, 129.8937500 32.7208334, 129.8937500 32.7166667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral