Among other disclosure, a computer-implemented method for creating an electronic communication includes identifying, for an electronic communication regarding multiple items that is to be sent, a default value that applies to at least one of the items. The method includes including the default value in a default component configured for holding multiple default values. The method includes identifying a data structure that is common to more than one of the multiple items. The method includes defining the data structure in a list component configured for holding multiple data structures. The method includes forwarding the electronic communication, including the default component and the list component.