<wrap> – inline wrapperxml:langidstyle/classPossible Contents: (Text | inline element)*
Description:
This doesn't format, it encloses inline elements that then get an
id or a language via xml:lang. It can be useful empty.
For example
<wrap id="NicePosition"/>
is equal to LaTeX's \label{NicePosition}. So you can refer
to a special position in your text with <pageref>.