I would like to add my $0.02 to Gerrit's suggestion of using the
<alt> element. The other solution would be to use the exclude=
attribute. (I don't like it as much because it doesn't scale as
well, but conceptually I think of it as the same as <alt>.) I don't
think this sort of indecision (of which I am often guilty) amounts to
But I have to admit that I'm quite surprised no one has suggested
<choice> with child <seg> elements.