External module in the base Suite that names all the external modules (except itself) that are part of the base Suite
A Tag Set selects from the named modules by referencing the external parameter entities defined in the Module to Name the
Modules. To include a set of elements (such as all the lists or the MathML elements), a DTD references the external parameter
entity of the module that contains those elements.
Implementor’s Note: This module does not declare itself, the DTD, any of the Journal Publishing customization modules, or the Tag-Set-specific
Module of Modules for this Tag Set.