Vim

Vim is a text editor.

It edits text.

Editing XML (dix, transfer rules) in vim

http://www.pinkjuice.com/howto/vimxml/ is a nice guide to editing XML in vim

Editing Xerox formats in vim

Various people have created lexc/twol syntax files for vim:

• https://github.com/arnsholt/proiel-morphology/tree/master/vim
• https://github.com/flammie/vim-finitestatemorphology (works with vundle as flammie/vim-finitestatemorphology)
• https://github.com/jonorthwash/dotfiles/tree/master/vim

See also Apertium-specific conventions for lexc#Syntax highlighting and folding in vim