Required attribue with a default enumerated attribute value

Hi again,

Is it possible to make a required attribue with a default enumerated attribute value.

At the moment I have something like this in my DTD file:

< !ATTLIST element-name attribute-name (en1|en2|en3) "en3">

This means that this is valid when I dont't want it to be:

< element-name> < element-name />
 
Is it possible then to force the attribute-name to be present so in an XML Editor when the element-name is created it automatically creates this:
 
< element-name attribute-name = "en3"> < element-name />
 
Thanks,
Graeme
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