... I am curious however; would you
consider XML-based format as the preferred format for future
developments, rather than adopting the plain-text "Format A." available
at Unicode website?
Both the UTR #22 XML format and ICU's .ucm format provide syntax for the distinction between roundtrip mappings (A maps to B and B maps back to A) and one-way mappings/fallbacks/reverse mappings (A maps to B but B does not map back to A). You can achieve this in many ways and formats, but "Format A." itself does not support it.
markus
