メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((139.5250000 35.6291667, 139.5312500 35.6291667, 139.5312500 35.6333333, 139.5250000 35.6333333, 139.5250000 35.6291667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral