The abbreviations deriving from Latin, listed in CC's post, will be handled like this:

• Each distinct abbreviation will have a <glyph> element in the <charDecl> section of the file header, explaining it briefly.
• Each instance of the abbreviation will be marked up in the original transcription following this pattern:

  <choice>
    <abbr>Vo<hi rend="vertical-align: super;"><g ref="#theGlyphTag">9</g></hi></abbr>
    <expan>Vous</expan>
  </choice>
  

• The XSLT will display ONLY the rendered <abbr> element, and will give it a @title attribute for mouseover which is constructed from the information in the <glyph> element(s) referenced inside the <abbr>. This differs from a regular <choice>/<abbr>/<expan>, in which the <expan> is used as the @title attribute. The actual expansion will normally be available to readers in the modernized transcription, since these all occur in the engravings.