[xliff-tools] The Domain

[Bruno Haible]

1.3 Domain

This should be represented as either <group>, as proposed, or a <file> element
for each domain. (Remember that msgfmt of a multi-domain PO file creates
multiple MO files.) It's not yet clear to me which is better.

Note that PO files can contain multiple "domain" statements, and the
same domain can be contributed to in multiple sections of the file. This is
valid:

  domain A
   ...
  domain B
   ...
  domain A
   ...
  domain C
   ...
  domain B
   ...

and is equivalent to three PO files: one for domain A, one for B, one for C.

Bruno