(topic equation-d)
The Inline Equation element (<equation-inline>) represents an
equation that is intended to be rendered inline with its surrounding content. The
equation content may be represented in any number of ways, including embedded MathML
using the <mathml> specialization of <foreign>, a reference to an image,
inline TeX markup, or any other way that an equation might be defined. The equation may
include alternative forms, such as both a MathML version and an image.
The Block Equation element (<equation-block>) represents
an equation to be rendered as a block. Block equations may be numbered. The
equation content may be represented in any number of ways, including embedded MathML
using the <mathml> specialization of <foreign>, a reference to an image,
inline TeX markup, or any other way that an equation might be defined. The equation may
include alternative forms, such as both a MathML version and an image.
The Equation Number element (<equation-number>) indicates
that the equation should be numbered. If the <equation-number> element has empty or
whitespace-only content, then the number should be generated. If the <equation-number>
element has content other than whitespace, the content should be used as the number.
The Equation Figure element (<equation-figure>) represents an
equation that may have a title or a description and that may be numbered. When equation
figures are numbered they are often numbered separately from figures. Note that block
and inline equations may also be numbered. The equation figure element is intended for
equations that are not part of the rhetorical flow of a document but that are presented
either out of line or otherwise need a title or description. Equation figures that are
simply a single equation plus, optionally, a title or description, may use the
<mathml> element directly. When the display equation content is more complicated,
it should use >equation-block> to clearly distinguish the equation content from
non-equation content, such as paragraphs that provide commentary on the equations within
the display equation. The equation content may be represented in any number of ways,
including embedded MathML using the <mathml> specialization of <foreign>, a
reference to an image, inline TeX markup, or any other way that an equation might be
defined. The equation may include alternative forms, such as both a MathML version and
an image.