/**
* ${@inheritDoc}.
*
* @see
* org.openstreetmap.osm.data.IDataSet#containsRelation(org.openstreetmap.osmosis.core.domain.v0_5.Relation)
*/
public boolean containsRelation(final Relation aR) {
if (myCachingDataSet.containsRelation(aR)) return true;
Relation n = myDataSource.getRelationByID(aR.getId());
if (n == null) return false;
myCachingDataSet.addRelation(n);
return true;
}
