メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((139.5250000 35.9375000, 139.5312500 35.9375000, 139.5312500 35.9416667, 139.5250000 35.9416667, 139.5250000 35.9375000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral