External module in the NCBI Book DTD (and NCBI Collection DTD) that names all Book-DTD-specific Suite external modules to be used by the two DTDs. (Note: This module does not declare itself, either DTD, any of the base DTD Suite modules, or the Suite Module of Modules which declares the base DTD Suite modules.)
<!ENTITY % bookcustom-modules.ent PUBLIC "-//NLM//DTD Book DTD Module of Modules v2.1 20050630//EN" "bookcustom-modules.ent" >
bookcollection.dtd / book.dtd