External module in the NCBI Book DTD (and NCBI Collection DTD) that defines book-level metadata elements
Metadata elements for book components are declared in a separate module, %bookpart.ent;.
<!ENTITY % bookmeta.ent PUBLIC "-//NLM//DTD NCBI Book DTD Book Metadata Elements v2.1 20050630//EN" "bookmeta.ent" >
bookcustom-modules.ent