Keep ordinary sentence punctuation outside MathML

[abcdsen-create]

Priority: High

Description

Document
that punctuation serving an ordinary sentence function must remain outside
MathML. For example, a colon introducing a list should separate two MathML
expressions as ordinary HTML text. Inside MathML, the colon may be interpreted
as a ratio or spoken as “divided by.”

Recommended markup

<math
xmlns="http://www.w3.org/1998/Math/MathML">

<!-- first expression -->

</math>:
<math xmlns="http://www.w3.org/1998/Math/MathML">

<!-- following mathematical list -->

</math>

Acceptance criteria

• Guidance distinguishes sentence punctuation from mathematical operators.
• A colon introducing a list is shown outside MathML.
• Guidance warns that placing an isolated colon in <mtext> may not reliably prevent mathematical interpretation.
• The example is verified with the supported text-to-speech pipeline.