Names all external modules specific to the Article Authoring Tag Set, such as the %articleauthcustom-classes.ent; module
<!ENTITY % articleauthcustom-modules.ent PUBLIC "-//NLM//DTD Article Authoring DTD-Specific Modules v3.0 20080202//EN" "articleauthcustom-modules3.ent" >
articleauthoring3.dtd