'Dir/LR' and 'Dir/RL' marks at the end of a lexc file line must be converted to <e r="LR"> and <e r="RL"> attributes, respectively

[IlnarSelimcan]

Other marks, namely Use/MT and Err/Orth (there might be others) to my knowledge currently don't have corresponding attributes in .dix files, but nonetheless must be preserved, e.g. in comment attributes.

[Techievena]

Any wiki or doc that has the complete list of the marks to be restored?

[IlnarSelimcan]

@Techievena , http://wiki.apertium.org/wiki/Apertium-kaz . So, it's the 4 marks already mentioned:
Dir/LR, Dir/RL, Use/MT, Err/Orth plus marks starting with Der/, e.g. Der/Pass, Der/Caus and Der/Coop. But technically all of them are in fact comments. I think preserving comments when converting a .lexc to .dix is a good idea in general.

Dir/LR or Dir/RL marks must become 'r' attributes of the <e>ntry, but for other comments (in particular the ones spanning multiple lines), I think it's fine if they end up insdie of a <!-- -->. Talk to @flammie about this too.