メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((139.4187500 35.9583333, 139.4250000 35.9583333, 139.4250000 35.9625000, 139.4187500 35.9625000, 139.4187500 35.9583333)) ^^http://www.opengis.net/ont/geosparql#wktLiteral