| QGIS API Documentation
    3.20.0-Odense (decaadbb31)
    | 
#include "qgsrelation.h"#include "qgsapplication.h"#include "qgsfeatureiterator.h"#include "qgslogger.h"#include "qgsproject.h"#include "qgsvectorlayer.h"#include "qgsrelation_p.h"#include "qgspolymorphicrelation.h"#include "qgsrelationmanager.h"