Originally Posted by HarryT
Footnotes HAVE to be converted to something or other, given that no current reading device supports footnotes in the true sense of the word - ie notes at the foot of the current page. (Other than for things like PDF files.)
My point is that the concept of footnotes is useful, and any inabilities in markup languages or rendering engines should be seen by authors and readers as temporary deficiencies that need quick remedy. WYSIWYG (haven't used that acronym in a while) word processors show us that it is possible to include footnotes in the scope of reflowing text.
In the Discworld case, in the meantime, I would do as DaleDe mentions, and include them as delimited notes in line with the text, as sidebars or "between bars" beneath the referencing paragraph.