メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((137.3250000 35.2208334, 137.3312500 35.2208334, 137.3312500 35.2250000, 137.3250000 35.2250000, 137.3250000 35.2208334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral