#include <FWCore/Framework/interface/ESProducts.h>
Description: Container for multiple products created by an ESProducer
Usage: This is used as a return type from the produce method of an ESProducer. Users are not anticipated to ever need to directly use this class. Instead, to create an instance of the class at method return time, they should call the helper function es::products or 'output' the values to es::produced via the '<<' operator.