メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((139.4125000 35.7000000, 139.4187500 35.7000000, 139.4187500 35.7041667, 139.4125000 35.7041667, 139.4125000 35.7000000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral