Additional information tied to a particular location in the text. This material is not considered to be part of the body of the text, but is a note used instead of, in addition to, as a source for, or as a commentary on either some body text or on an element in the metadata such as an author.
A footnote <fn> usually contains material that cannot stand alone: material that is related to a word, phrase, or paragraph already in the basic textual material and thus is tied to a particular location in the text. This material is not considered to be part of the body of the text, but is an explanatory note instead of, in addition to, as a source for, or as a commentary on either some body text or on an element in the metadata such as an author.
In print, footnotes are traditionally displayed at the bottom of a printed page or in a list at the end of the book or book part (<fn-group>). Each footnote reference is marked by a number or symbol, and the text of the footnote is prefixed by the same number or symbol to help the reader associate the text with its reference(s). On screen, footnotes may appear as clickable icons, in a separate pop-up window, in a list with links at the end of the book or chapter (<fn-group>), or in a separate footnote area.
A reference to a <fn> is made with the <xref> element.
Language: To describe a footnote that is not in the same language as the original document (for example, a Latin or Greek footnote for a document in English) use the @xml:lang attribute on the <fn> element.
Best Practice: When footnotes are grouped at the end of a book or chapter, wrap them in a <fn-group> and use an <xref> element in the text, as usual, to tie each footnote in the list to a particular location in the text.
<!ELEMENT fn %fn-model; >
(label?, (p)+)
The following, in order:
<abbrev>, <addr-line>, <aff>, <alt-title>, <anonymous>, <article-title>, <attrib>, <author-notes>, <award-id>, <bold>, <book-title>, <book-volume-id>, <book-volume-number>, <chapter-title>, <chem-struct>, <code>, <collab>, <comment>, <compound-kwd-part>, <conf-acronym>, <conf-loc>, <conf-name>, <conf-num>, <conf-sponsor>, <conf-theme>, <contrib>, <contrib-group>, <copyright-statement>, <corresp>, <def-head>, <degrees>, <disp-formula>, <edition>, <element-citation>, <email>, <etal>, <ext-link>, <fax>, <fixed-case>, <fn-group>, <funding-source>, <funding-statement>, <given-names>, <gov>, <inline-formula>, <inline-supplementary-material>, <institution>, <issue>, <issue-part>, <issue-title>, <italic>, <kwd>, <label>, <license-p>, <meta-name>, <meta-value>, <mixed-citation>, <monospace>, <named-content>, <nav-pointer>, <on-behalf-of>, <overline>, <p>, <part-title>, <patent>, <phone>, <prefix>, <preformat>, <product>, <publisher-loc>, <publisher-name>, <related-article>, <related-object>, <role>, <roman>, <sans-serif>, <sc>, <see>, <see-also>, <see-also-entry>, <see-entry>, <self-uri>, <series>, <sig>, <sig-block>, <source>, <speaker>, <std-organization>, <strike>, <string-conf>, <string-date>, <string-name>, <styled-content>, <sub>, <subject>, <subtitle>, <suffix>, <sup>, <supplement>, <surname>, <table-wrap-foot>, <target>, <td>, <term>, <term-head>, <th>, <title>, <trans-source>, <trans-subtitle>, <trans-title>, <underline>, <unstructured-kwd-group>, <uri>, <verse-line>, <volume>, <volume-id>, <volume-series>, <volume-title>, <xref>
In the footer of a table:
...
<table-wrap id="bid.269">
<label>1</label>
<caption>
<title>Files on the taxonomy FTP site.</title>
</caption>
<table>
<thead>
<tr>
<th align="left" valign="top">File</th>
<th align="left" valign="top">Uncompresses to</th>
<th align="left" valign="top">Description</th>
</tr>
</thead>
<tbody>
<tr>
<td align="left" valign="top">taxdump.tar.Z<xref ref-type="fn"
rid="mul2"><sup><italic>a</italic></sup></xref></td>
<td align="left" valign="top">readme.txt</td>
<td align="left" valign="top">A terse description of the dmp
files</td>
</tr>
<tr>
<td align="left" valign="top"></td>
<td align="left" valign="top">nodes.dmp</td>
<td align="left" valign="top">Structure of the database; lists
each taxid with its parent taxid, rank, and other values
associated with each node (genetic codes, etc.)</td>
</tr>
<tr>...</tr>
...
</tbody>
</table>
<table-wrap-foot>
<fn symbol="a" id="mul2">
<p>For non-UNIX users, the file taxdmp.zip includes the
same (zip compressed) data.</p>
</fn>
</table-wrap-foot>
</table-wrap>
...
In author notes:
...
<book-meta>
...
<contrib-group>
<contrib contrib-type="author">
<name><surname>Hajnsdorf</surname>
<given-names>Eliane</given-names></name>
</contrib>
<contrib contrib-type="author">
<name><surname>Régnier</surname>
<given-names>Philippe</given-names></name>
<xref ref-type="author-notes" rid="FN150">*</xref>
</contrib>
</contrib-group>
<aff>Institut de Biologie Physico-Chimique, 13 rue Pierre
et Marie Curie, 75005 Paris, France</aff>
<author-notes>
<fn id="FN150">
<p>To whom reprint requests should be addressed.
E-mail: <email>regnier@ibpc.fr</email>.</p>
</fn>
<fn fn-type="com">
<p>Communicated by Marianne Grunberg-Manago,
Institute of Physico-Chemical Biology, Paris, France</p>
</fn>
</author-notes>
...
</book-meta>
...
In a footnote group:
...
<book-back>
<ack>
<p>We are grateful to Uri Alon, Harley McAdams, Lee Kroos,
Patrick Piggot, and Patrick Stragier for critical comments
of the manuscript. ...</p>
...
</ack>
<fn-group>
<fn id="n1" fn-type="conflict">
<p><bold>Conflicts of interest.</bold> The authors have declared
that no conflicts of interest exist.</p>
</fn>
<fn id="n2" fn-type="con">
<p><bold>Author contributions.</bold> PE, MF, STJ, EMC, DZR,
TS, JSL, and RL conceived and designed the experiments. PE,
MF, DZR, STW, CF, and KH performed the experiments. PE, MF,
STJ, EMC, DZR, and JSL analyzed the data. PE, MF, STJ, EMC,
DZR, and JSL contributed reagents/materials/analysis tools. PE,
MF, STJ, EMC, JSL, and RL wrote the paper.</p>
</fn>
</fn-group>
</book-back>
...