Number and/or prefix word placed at the beginning of display elements (for example, equation, statement, figure).
As an example, a label placed at the beginning of an equation (<disp-formula>) could be a number such as <label>Equation 3.</label>, <label>(3)</label>, or <label>3.</label>. A label before a statement such as a Proof or Lemma, could be a word such as <label>Proof</label> or <label>Hypothesis</label>.
Many objects can take explicit labels. For example, a <label> can contain the number or symbol used as a prefix character for a footnote that is placed at the point of the footnote reference. Similarly, the number and any prefix word associated with the title or the caption of a <fig> can be marked as a <label>, for example, “Figure 3.”, “Exhibit 2.”, or “3.”.
In Citations: A <label> can be used to preserve the prefix number for a reference or citation “25.” or “[Lapeyre 2010]”. This can be useful when reconstructing untagged cross-references.
Accessibility: Sometimes a <label> needs to be pronounced in a way that is not reflected in its content or its tagging. The @alt attribute can be used to record the pronunciation for screen readers and other accessibility devices. For example, the element figure that follows might be pronounced as “Figure 3”.
<label alt="figure 3">Fig&#x00A0;III.</label>
<!ELEMENT label (#PCDATA %label-elements;)* >
(#PCDATA | bold | italic | monospace | overline | roman | sans-serif | sc | strike | underline | alternatives | inline-graphic | private-char | chem-struct | inline-formula | sub | sup)*
Any combination of:
<abstract>, <ack>, <aff>, <app>, <app-group>, <author-notes>, <back>, <bio>, <boxed-text>, <chem-struct>, <chem-struct-wrap>, <corresp>, <def-list>, <disp-formula>, <disp-formula-group>, <disp-quote>, <element-citation>, <fig>, <fig-group>, <fn>, <fn-group>, <glossary>, <graphic>, <kwd-group>, <list>, <list-item>, <media>, <mixed-citation>, <note>, <notes>, <ref>, <ref-list>, <sec>, <statement>, <supplementary-material>, <table-wrap>, <table-wrap-group>, <trans-abstract>, <verse-group>
...
<sec><title>Outcome data</title>
...
<p>Figure <xref ref-type="fig" rid="F2">2</xref> shows that
overall there was no significant difference between day hospital
and alternative forms ...</p>
<fig id="F2"><label>Figure 2</label>
<caption><p>Odds of death or poor outcome in patients
receiving day hospital care or alternative services (random
effects model). Heterogeneity between trials is presented
as χ<sup>2</sup></p></caption>
<graphic xmlns:xlink="http://www.w3.org/1999/xlink"
xlink:href="fors2662.f2"></graphic>
</fig>
</sec>
...
JATS-common1.ent