...
TEI Templates
Encoding Issues for Discussion at Meeting
...
Petrarchive Encoding Guidelines
PDF version available here.
Andron Scriptor Web
The Word documents of the diplomatic transcriptions of each Charta use Andron Scriptor Web, which you can download here: http://folk.uib.no/hnooh/mufi/fonts/#Andron. Click Andron Scriptor Web and download the latest version. This is for visualizing special characters (in Word only), which would otherwise look as empty boxes.