Mathematical equation, expression, or formula that is to be displayed as a block (callout) within the narrative flow.
Any combination of:
Text, numbers, or special characters
<alt-text> Alternate Text Name (For a Figure, etc.)
<long-desc> Long Description
<email> Email Address
<ext-link> External Link
<uri> Uniform Resource Indicator (URI)
<break> Line Break
<bold> Bold
<italic> Italic
<monospace> Monospace Text (Typewriter Text)
<overline> Overline
<roman> Roman
<sans-serif> Sans Serif
<sc> Small Caps
<strike> Strike Through
<underline> Underline
<inline-graphic> Graphic, Inline
<private-char> Private Character (Custom or Unicode™)
<chem-struct> Chemical Structure (Display)
<inline-formula> Formula, Inline
<label> Label (of an Equation, Figure, Reference, etc.)
<named-content> Named Special (Subject) Content
<styled-content> Styled Special (Subject) Content
<tex-math> TeX Math Equation
<mml:math> Math (MathML 2.0 Tag Set)
<alternatives> Alternatives For Processing
<array> Array (Simple Tabulation)
<graphic> Graphic
<media> Media Object
<preformat> Preformatted Text
<sub> Subscript
<sup> Superscript