メタデータ名 observationStatus-N
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.0187500 36.7500000, 140.0250000 36.7500000, 140.0250000 36.7541667, 140.0187500 36.7541667, 140.0187500 36.7500000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral