Additional material added to — and usually following — the contents of a book, for example, a table (or set of tables), maps or charts, notes, etc. This is ancillary or supporting material, not a direct continuation of the text of a book or book component such as a chapter.


While ancillary material, such as appendices, may follow the entire contents of a book, a publisher may prefer that such ancillary material follow the content of the book component where it is referenced. The NCBI Book DTD has been designed so that ancillary material may be included in the back matter of a <book> or <book-part> element.


id Identifier

Model Information

Content Model

<!ELEMENT  app          %app-model;                                  >


The following, in order:

This element may be contained in:

<app-group> Appendix Matter

Tagged Example

<app id="bid.301">
<title>Appendix 1. TAXON nametypes.</title>
<sec id="bid.302">
<title>Scientific Name</title>
<p>Every node in the database is required to have ...</p>
<app id="bid.317">
<title>Appendix 2. Functional classes of TAXON scientific names.</title>
<app id="bid.331">
<title>Appendix 3. Other TAXON data types.</title>