メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((134.7375000 35.6250000, 134.7437500 35.6250000, 134.7437500 35.6291667, 134.7375000 35.6291667, 134.7375000 35.6250000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral