メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((139.4187500 34.7166667, 139.4250000 34.7166667, 139.4250000 34.7208334, 139.4187500 34.7208334, 139.4187500 34.7166667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral