メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((134.4187500 34.9166667, 134.4250000 34.9166667, 134.4250000 34.9208334, 134.4187500 34.9208334, 134.4187500 34.9166667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral