メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((130.7562500 31.7125000, 130.7625000 31.7125000, 130.7625000 31.7166667, 130.7562500 31.7166667, 130.7562500 31.7125000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral