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<disp-formula> Formula, Display

Mathematical equation, expression, or formula that is to be displayed as a block (callout) within the narrative flow.

Usage/Remarks

A <disp-formula> need not be a “formula” in the strict mathematical sense, but can be used for any mathematical expression or equation.
This element may contain the actual characters that make up an equation or formula or a graphic that contains the formula. Thus, the mathematics can be expressed as ASCII characters; MathML, TeX, or LaTeX expressions; or as a graphic or series of graphics.
A display equation may numbered, using automatic numbering or by storing the number in a <label> element.
Related Elements
For a mathematical equation, expression, or formula which is to be displayed inline with the text, use the <inline-formula> element.
Attributes
content-type
originator
specific-use

Base Attributes

id
xml:base
xml:lang
Models and Context
May be contained in
<ack>, <app>, <app-group>, <bio>, <body>, <boxed-text>, <disp-formula-group>, <disp-quote>, <fig>, <glossary>, <index>, <index-div>, <index-group>, <license-p>, <named-content>, <non-normative-example>, <non-normative-note>, <normative-example>, <normative-note>, <notes>, <p>, <ref-list>, <sec>, <see>, <see-also>, <see-also-entry>, <see-entry>, <styled-content>, <supplementary-material>, <table-wrap>, <tbx:crossReference>, <tbx:definition>, <tbx:entailedTerm>, <tbx:example>, <tbx:externalCrossReference>, <tbx:note>, <tbx:pronunciation>, <tbx:see>, <tbx:source>, <tbx:term>, <tbx:usageNote>, <td>, <term>, <term-display>, <term-sec>, <th>
Description
Any combination of:
Content Model
<!ELEMENT  disp-formula %disp-formula-model;                         >
Expanded Content Model

(#PCDATA | alt-text | long-desc | email | ext-link | uri | break | caption | legend | bold | fixed-case | italic | monospace | num | overline | roman | sans-serif | sc | strike | underline | ruby | inline-code | inline-graphic | inline-media | private-char | chem-struct | inline-formula | kwd-group | subj-group | non-normative-note | normative-note | non-normative-example | normative-example | notes-group | label | named-content | styled-content | tex-math | mml:math | alternatives | array | code | graphic | media | preformat | sub | sup)*

Tagged Samples
Equation using <mml:math> 
...
<p>In the case of dollies of diameter 20 mm, the 
 breaking strength, in megapascals, is given by
 <xref ref-type="disp-formula" rid="formula_2">Formula
 (2)</xref>
 <disp-formula id="formula_2"
  ><mml:math display="block" 
     id="mml_m2"
     xmlns:mml="http://www.w3.org/1998/Math/MathML" >
   <mml:mrow>
    <mml:mi>s</mml:mi><mml:mo>=</mml:mo>
    <mml:mfrac>
     <mml:mrow>
      <mml:mn>4</mml:mn><mml:mi>F</mml:mi></mml:mrow>
     <mml:mrow>
      <mml:mn>400</mml:mn><mml:mi>p</mml:mi></mml:mrow>
    </mml:mfrac>
    <mml:mo>=</mml:mo>
    <mml:mfrac>
     <mml:mi>F</mml:mi>
     <mml:mrow>
      <mml:mn>314</mml:mn></mml:mrow>
    </mml:mfrac>
   </mml:mrow>
  </mml:math>
  <label>(2)</label>
 </disp-formula>
</p>
...
Showing varied placement of the label and captions 
...
<disp-formula>
 <mml:math>...</mml:math>
 <caption>
  <p>In ... represents labor productivity growth between 
   time (t) and time (t – 1) and RATIOit the distance to the 
   labor productivity frontier for industry i at time t.</p>
 </caption>
</disp-formula>

<disp-formula>
 <label>(1)</label>
 <caption>
  <p>In ... represents labor productivity growth between 
   time (t) and time (t – 1) and RATIOit the distance to the 
   labor productivity frontier for industry i at time t.</p>
 </caption>
 <mml:math>...</mml:math>
</disp-formula>

<disp-formula>
 <label>(1)</label>
 <alternatives>
  <mml:math>...</mml:math>
  <graphic xlink:href="...">...</graphic>
 </alternatives>
 <caption>
  <p>n ... represents labor productivity growth between 
   time (t) and time (t – 1) and RATIOit the distance to the 
   labor productivity frontier for industry i at time t.</p>
 </caption>
</disp-formula>
...