メタデータ名 C21500-19700401
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.0437500 38.9000000, 141.0500000 38.9000000, 141.0500000 38.9041667, 141.0437500 38.9041667, 141.0437500 38.9000000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral