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<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).

Usage/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>”.
Accessibility
A <label> might need to be pronounced in a way that is not reflected in its content or its tagging. The @alt attribute can record the pronunciation for screen readers and other accessibility devices. For example, the equation label below might best be pronounced as “equation 3”, avoiding both the issue of the non-breaking-space character and the roman numerals. 
<label alt="equation 3">Eq. III.</label>
Attributes
alt

Multi-lang Attributes

lang-focus
lang-focus-custom
lang-group
lang-source
lang-source-custom
lang-translate
lang-variant
lang-variant-custom

Base Attributes

id
xml:base
xml:lang
Models and Context
May be contained in
<answer>, <answer-set>, <disp-formula>, <disp-formula-group>, <explanation>, <legend>, <list-item>, <option>, <question>, <question-preamble>, <question-wrap-group>, <statement>
Description
Text, numbers, or special characters, zero or more
Content Model
<!ELEMENT  label        (#PCDATA %label-elements;)*                  >
Expanded Content Model

(#PCDATA)*

Tagged Samples
Hypothesis in <statement> 
<article dtd-version="1.4d1">
 <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>
Alternative Spanish and English Variants of a Figure 
...<front>
    ...</front>
  <body>...
<fig id="f0001" lang-group="f0001"
  position="float" fig-type="scatter-graph" 
  xml:lang="en" lang-variant="translation" 
  lang-source="translator" lang-focus="secondary">
 <caption><p>Evolution of the repetition rate in all sequences</p></caption>
  <graphic xlink:href="RIYA_A_1889289_F0001_OC.jpg" 
    content-type="color" specific-use="web-only"/>
</fig>

<fig id="f0005" lang-group="f0001"  
  position="float" fig-type="scatter-graph" 
  xml:lang="es" lang-variant="original" 
  lang-source="author" lang-focus="primary">
  <caption><p>Evolución de la tasa de repetición en  
  todas las secuencias</p></caption>
  <graphic xlink:href="RIYA_A_1889289_F0005_OC.jpg" 
    content-type="color" specific-use="web-only"/>
</fig>...</body>
</article>
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