<disp-formula> Formula, Display

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


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.

Base Attributes

Models and Context
May be contained in
Content Model
<!ELEMENT  disp-formula %disp-formula-model;                         >
Expanded Content Model

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

Tagged Sample

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
 <disp-formula id="formula_2"
  ><mml:math display="block" 
     xmlns:mml="http://www.w3.org/1998/Math/MathML" >