メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.0562500 42.5291667, 142.0625000 42.5291667, 142.0625000 42.5333333, 142.0562500 42.5333333, 142.0562500 42.5291667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral