**************** INPUT ****************
[Illustration: One or more Caption lines

One or more Sub-caption lines]

[Illustration: The first line of a caption.

A caption that contains balanced [square] brackets in a paragraph.]

[Square brackets can be used to group several paragraphs.

This will generate warnings as normal.]

[Illustration: An ill-formed illustration might confuse.

It generates warnings.] The opening and closing tags no longer match.
**************** WARNINGS ****************
<expected>
  <error>
    <at line="10"/>
    <at line="12"/>
    <at line="16"/>
    <text>Mismatched square brackets?</text>
  </error>
  <error>
    <at line="14"/>
    <text>Mismatched illustration tag?</text>
  </error>
</expected>