Choices of attributes

[Tony]

How do I to define a tag wit two attributes that
are mutually exclusive?

So I want the tag to look like this:
<COM:descriptio n choice1="blah">
or
<COM:descriptio n choice2="blahbl ah">

BUT NOT
<COM:descriptio n choice1="blah" choice2="blahbl ah">

[David Carlisle]

Re: Choices of attributes

montana@ccs.neu .edu (Tony) writes:
[color=blue]
> How do I to define a tag wit two attributes that
> are mutually exclusive?
>
> So I want the tag to look like this:
> <COM:descriptio n choice1="blah">
> or
> <COM:descriptio n choice2="blahbl ah">
>
> BUT NOT
> <COM:descriptio n choice1="blah" choice2="blahbl ah">[/color]

What language do you want to use to make the definition?
XML DTD and W3C XML schema can not express that constraint.
You can express it in Relax NG or schematron for example.

David