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%toc-nav.ent; BITS Structural Table of Contents Module

Element declarations for the BITS navigation and pointing mechanism for structural Indexes and tables of Contents.
Declaration
<!ENTITY % toc-nav.ent  PUBLIC
"-//NLM//DTD BITS Table of Contents and Index Navigation Module v2.1 20220202//EN"
"BITS-toc-index-nav2-1.ent"                                            >