22.1.2.13 box

This element specifies the box object, which is used to group components of an equation or other instance of mathematical text. A boxed object can (for example) serve as an operator emulator with or without an alignment point, serve as a line break point, have associated argSz, or be grouped such as not to allow line breaks within. If boxPr is omitted, all properties will be “false” by default.

[Example: The mathematical text 𝑎 == 𝑏 uses a box around the double equal sign.

Its XML representation is as follows:

<m:r>
  <m:t>a</m:t>
</m:r>
<m:box>
  <m:boxPr>
    <m:opEmu m:val="1"/>
    <m:aln/>
  </m:boxPr>
  <m:e>
      <m:r>
        <m:t>==</m:t>
      </m:r>
  </m:e>
</m:box>
<m:r>
  <m:t>b</m:t>
</m:r>

end example]

[Note: The W3C XML Schema definition of this element’s content model (CT_Box) is located in A.6.1. end note]