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%backmatter.ent; Back Matter Elements Module

External module in the base Suite that contains elements typically used within publication back matter such as appendices.
Declaration
<!ENTITY % backmatter.ent
                        PUBLIC
"-//NLM//DTD JATS (Z39.96) JATS DTD Suite Back Matter Elements v1.3 20210610//EN"
"JATS-backmatter1-3.ent"                                           >