メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((139.2312500 36.7958334, 139.2375000 36.7958334, 139.2375000 36.8000000, 139.2312500 36.8000000, 139.2312500 36.7958334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral