メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.3187500 24.7791667, 141.3250000 24.7791667, 141.3250000 24.7833333, 141.3187500 24.7833333, 141.3187500 24.7791667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral