メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((137.0062500 36.4000000, 137.0125000 36.4000000, 137.0125000 36.4041667, 137.0062500 36.4041667, 137.0062500 36.4000000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral