How to specify validation properties in DTDs?

[Parik Rao]

Hi, I'm trying to figure out how do I do parameter validation in my DTD.
For example, I have an element which specifies a SIZE as an attribute.
I'd like to enforce certain rules : the charaacter data in size is
digits and the size is always less than 1,000,000 (for example).  As far
as I can figure out, there is no way to do this!   E.g.

<ATTLIST MYELEMENT
	SIZE CDATA #REQUIRED
>

Well, how do I set validation parameters for size?  I tried to play
around with entity but really couldn't come up with anything:

<!ENTITY % NUMBERONLY ...now I'm stuck>
<!ATTLIST MYELEMENT SIZE %NUMBERONLY;>

Anyone done this sort of thing?  Is this sort of validation beyond the
scope of DTDs?

--
Parik Rao
parikr at pointcast.com


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