メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((137.4062500 34.8916667, 137.4125000 34.8916667, 137.4125000 34.8958334, 137.4062500 34.8958334, 137.4062500 34.8916667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral