`<equation-figure>`

Use the `<equation-figure>`

element to represent an equation that
functions as form of figure or display. Display equations are intended to be numbered when
numbering is desired.

Since the `<equation-figure>`

element is specialized from
`<fig>`

, display equations can have titles, descriptions, figure
groups, and all other figure components. The direct children of
`<equation-figure>`

can be the equation content itself (for example,
`<mathml>`

or an image reference), or it can be one or more
`<equation-block>`

elements, along with other elements allowed within
`<fig>`

, such as paragraphs.

When an `<equation-figure>`

element has multiple direct child
`<mathml>`

, `<image>`

, or
`<pre>`

elements, each child represents an alternative form of the
equation. Processors are free to choose the form or forms that they use in deliverables. For
example, if there is both an image and MathML markup, an HTML-generating processor could
output both the image reference and the MathML with appropriate HTML `@class`

or `@id`

values to enable dynamic showing or hiding of one form or the other
based on browser capability. All other direct-child elements of
`<equation-figure>`

are treated normally.

When the intent is to have equations combined with other commentary within an
`<equation-figure>`

, the recommended best practice is to use child
`<equation-block>`

elements to contain the equations and clearly
distinguish them from the commentary.

See appendix for information about this element in OASIS document type shells.

+ topic/fig equation-d/equation-figure

In the following example, the

`<equation-figure>`

element contains a
title and
MathML:<equation-figure> <title>Display equation with a MathML container</title> <mathml> <m:math display='block'> <m:semantics> <m:mrow> <m:mfrac> <m:mrow> <m:mi>n</m:mi><m:mo>!</m:mo> </m:mrow> <m:mrow> <m:mi>r</m:mi><m:mo>!</m:mo><m:mrow><m:mo>(</m:mo> <m:mrow> <m:mi>n</m:mi><m:mo>−</m:mo><m:mi>r</m:mi> </m:mrow> <m:mo>)</m:mo></m:mrow><m:mo>!</m:mo> </m:mrow> </m:mfrac> </m:mrow> </m:semantics> </m:math> </mathml> </equation-figure>

In the following example, the

`<equation-figure>`

element contains a
title and an `<equation-block>`

element that contains MathML and
commentary:<equation-figure> <title>Display equation with a MathML container</title> <equation-block> <mathml> <m:math display='block'> <m:semantics> <m:mrow> <m:mfrac> <m:mrow> <m:mi>n</m:mi><m:mo>!</m:mo> </m:mrow> <m:mrow> <m:mi>r</m:mi><m:mo>!</m:mo><m:mrow><m:mo>(</m:mo> <m:mrow> <m:mi>n</m:mi><m:mo>−</m:mo><m:mi>r</m:mi> </m:mrow> <m:mo>)</m:mo></m:mrow><m:mo>!</m:mo> </m:mrow> </m:mfrac> </m:mrow> </m:semantics> </m:math> </mathml> </equation-block> <p>Where <equation-inline><mathml><m:math><m:mi>r</m:mi></m:math></mathml></equation-inline> is greater than 1.</p> </equation-figure>

The following attributes are available on this element: Universal attribute group, Display attribute group, outputclass, and spectitle.

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