メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((130.7875000 31.7500000, 130.7937500 31.7500000, 130.7937500 31.7541667, 130.7875000 31.7541667, 130.7875000 31.7500000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral