{
existingLayersTab = new String[nExistingLayers];
for(int i=0;i<nExistingLayers;i++)
{
Feature feature = poDstLayer.GetNextFeature();
existingLayersTab[i] = feature.GetFieldAsString( iTileIndexField);
if (i == 0)
{
DataSource poDS;
String filename = existingLayersTab[i];
int j;