Additional material added to — and usually following — an article, for example, a table (or set of tables), maps, notes, etc. This is ancillary or supporting material, not a direct continuation of the text of an article.
<!ELEMENT app %app-model; >
The following, in order:
<article>
<front>
...</front>
<body>...</body>
<back>
<ref-list>...
</ref-list>
<app-group>
<app><title>Appendix</title>
<sec><title>The Bipolar Seesaw.</title>
<p>The evidence for the antiphasing of the millennial-duration climate
changes occurring on the Antarctic continent ...</p>...
</app>
</app-group>
</back>
</article>
backmatter.ent