External module in the NCBI Book DTD (and NCBI Collection DTD) that sets up the Parameter Entities and element mix definitions that will be used to over-ride some element mixes in the Suite
<!ENTITY % bookcustom-mixes.ent PUBLIC "-//NLM//DTD NCBI Book DTD Over-ride Mixes Module v2.3 20070202//EN" "bookcustom-mixes.ent" >
bookcustom-modules.ent