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%bookcustom-mixes.ent; DTD-Specific Mix Customizations Module

Set up the Parameter Entities and element mix definitions that will be used to override some element mixes in the DTD Suite.
Declaration
<!ENTITY % bookcustom-mixes.ent
                        PUBLIC
"-//NLM//DTD BITS Book Interchange DTD Customize Mixes Module v2.2 20250930//EN"
"BITS-bookcustom-mixes2-2.ent"                                         >