メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((137.2750000 34.6291667, 137.2812500 34.6291667, 137.2812500 34.6333333, 137.2750000 34.6333333, 137.2750000 34.6291667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral