private void addToSet(ObjectXmlPersist persist,IFile file,String setName) throws IOException, CoreException {
  Collection<RelationSetDescriptor> updateSet=loadRelationSets(persist,file);
  persistUpdatedBundle(persist,file,updateSet,setName);
}

private void addToSet ( ObjectXmlPersist persist , IFile file , String setName ) throws IOException , CoreException { Collection < RelationSetDescriptor > updateSet = loadRelationSets ( persist , file ) ; persistUpdatedBundle ( persist , file , updateSet , setName ) ; }
add the set to an existing file .
