Mondrian: Decisions during eDITem project

These are decisions taken during the eDITem project that have to be worked into the rest of the documentation. For the moment, we document them here.

Superscript: to be silently removed and usually replaced by '.': e.g. Mr., No.

Unusual abbreviations: to be coded as <choice><expan>

We will not be using sic and corr, but orig and reg

we only keep the changed (added, deleted) string within the element and keep the unchanged part out of these elements

For now we regularise layout of postcards the way we do letters