メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((139.4250000 37.3916667, 139.4312500 37.3916667, 139.4312500 37.3958334, 139.4250000 37.3958334, 139.4250000 37.3916667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral