メタデータ名 C810
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.4000000 38.9208334, 141.4062500 38.9208334, 141.4062500 38.9250000, 141.4000000 38.9250000, 141.4000000 38.9208334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral