<label>
Label (of an Equation, Figure, Reference, etc.)
Number and/or prefix word placed at the beginning of display elements (for example, equation, statement, figure).
Remarks
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 III.</label>
Content Model
<!ELEMENT label (#PCDATA %label-elements;)* >
Expanded Content Model
(#PCDATA | bold | fixed-case | italic | monospace | overline | roman | sans-serif | sc | strike | underline | ruby | alternatives | inline-graphic | private-char | chem-struct | inline-formula | sub | sup)*
Description
Any combination of:
- Text, numbers, or special characters
- Emphasis Elements
- <alternatives> Alternatives For Processing
- Inline Display Elements
- <chem-struct> Chemical Structure (Display)
- <inline-formula> Formula, Inline
- Baseline Change Elements
This element may be contained in:
<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>
Example 1
For a table:
...
<table-wrap id="t2" orientation="portrait" position="float">
<label>Table II.</label>
<caption>
<p>Models to approximate the bound frequencies as waves
in X→M (<inline-graphic id="g1" xlink:href="d1"/>: Rotational,
<inline-graphic id="g2" xlink:href="d2"/>: Vibrate in <italic>y</italic>
direction, <inline-graphic id="g3" xlink:href="d3"/>: Vibrate in
<italic>x</italic> direction, <inline-graphic id="g4" xlink:href="d4"/>:
Vibrate mainly in <italic>y</italic> direction including a small
portion of vibration in <italic>x</italic> direction,
<inline-graphic id="g5" xlink:href="d5"/>: Vibrate mainly in
<italic>x</italic> direction including a small portion of vibration
in <italic>y</italic> direction).</p>
</caption>
<table border="1">...</table>
</table-wrap>
...Example 2
For a figure:
...
<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>
...
...
<fig id="f3" position="float">
<label>FIG. 3.</label>
<caption>...</caption>
<alternatives>
<graphic specific-use="print" xlink:href="1.4821168.figures.highres.f3.zip"/>
<graphic specific-use="online" xlink:href="1.4821168.figures.online.f3.jpg"/>
</alternatives>
</fig>
...Example 3
In a note:
...
<ref id="c35">
<label>35.</label>
<note>
<p>The geometric optimization and electronic transport properties are
all calculated by a developed <italic>ab-initio</italic> software package
Atomistix ToolKit, which is based on the spin-polarized density-functional
theory combined with the non-equilibrium Greens functions. ...</p>
</note>
</ref>
...Example 4
In an element-style bibliographic reference (punctuation and spacing removed):
...
<ref id="B8">
<label>8</label>
<element-citation publication-type="journal">
<person-group person-group-type="author">
<name><surname>Weissert</surname>
<given-names>W</given-names></name>
<name><surname>Wan</surname>
<given-names>T</given-names></name>
<name><surname>Livieratos</surname>
<given-names>B</given-names></name>
<name><surname>Katz</surname>
<given-names>S</given-names></name>
</person-group>
<article-title>Effects and costs of day-care
services for the chronically ill: a randomized
experiment</article-title>
<source>Medical Care</source>
<year iso-8601-date="1980">1980</year>
<volume>18</volume>
<fpage>567</fpage>
<lpage>584</lpage>
<pub-id pub-id-type="pmid">6772889</pub-id>
</element-citation>
</ref>
...
Example 5
In a mixed-style bibliographic reference (punctuation and spacing preserved):
...
<ref id="B1">
<label>1</label>
<mixed-citation publication-type="book">
<collab>Research Unit of the Royal College of Physicians
and British Geriatric Society</collab>.
<source>Geriatric day hospitals: their role and guidelines
for good practice</source>. <publisher-loc>London</publisher-loc>:
<publisher-name>RCP</publisher-name>;
<year iso-8601-date="1994">1994</year>.
</mixed-citation>
</ref>
...
Example 6
For a hypothesis:
<article dtd-version="1.2d1">
<front>...</front>
<body>
...
<p>Industrial buyers categorise foreign countries
according to their level of technological achievement
and subsequently differentiate their perceptions of
these countries accordingly. ... The following
hypothesis is posited:
<statement><label>Hypothesis 1</label>
<p>Buyer preferences for companies are influenced
by factors extrinsic to the firm attributable to, and
determined by, country-of-origin effects.</p>
</statement>
</p>
...
</body>
<back>...</back>
</article>