Container element for one or more appendices (<app> elements).
The following, in order:
<label> Label (of an Equation, Figure, Reference, etc.), zero or one
<title> Title, zero or one
Any combination of:
<address> Address/Contact Information
<alternatives> Alternatives For Processing
<array> Array (Simple Tabulation)
<boxed-text> Boxed Text
<chem-struct-wrap> Chemical Structure Wrapper
<fig> Figure
<fig-group> Figure Group
<graphic> Graphic
<media> Media Object
<preformat> Preformatted Text
<supplementary-material> Supplementary Material
<table-wrap> Table Wrapper
<table-wrap-group> Table Wrapper Group
<disp-formula> Formula, Display
<disp-formula-group> Formula, Display Group
<p> Paragraph
<def-list> Definition List
<list> List
<tex-math> TeX Math Equation
<mml:math> Math (MathML 2.0 Tag Set)
<related-article> Related Article Information
<related-object> Related Object Information
<ack> Acknowledgments
<disp-quote> Quote, Displayed
<speech> Speech
<statement> Statement, Formal
<verse-group> Verse Form for Poetry
<x> X - Generated Text and Punctuation
<app> Appendix
<ref-list> Reference List (Bibliographic)