Create DTD from XML document

Question

Hello,
I have a little problem creating a DTD from an XML document. The XML document looks the following:
<data name="data1">
<value id="abc" name="value1" />
<value id="def" name="value2" />
<value id="ghi" name="value3" />
</data>
<data name="data2">
<value id="123" name="valueA" />
<value id="456" name="valueB" />
<value id="789" name="valueC" />
</data>
The problem concerns the attribute list of the value element,
on the one hand I could create a DTD like this:
<!ATTLIST value id CDATA #REQUIRED
name CDATA #REQUIRED
>
On the other hand I could do it like this:
<!ATTLIST value id (abc|def|ghi|123|456|789) #REQUIRED
name (value1|value2|value3|valueA|valueB|valueC)
#REQUIRED
>
Now I don't know what's the right way. I would be glad if anybody could give me support for my problem.
Thank you very much,
Findus

Answer 1

No...this is not the solution for my problem. The first problem with the code you posted is that I can create a valid XML document like this:
<data name="data2">
<value id="123" name="value1" />
<value id="456" name="value2" />
<value id="789" name="value3" />
</data>
(Please compare to the lines below in order to recognize the difference)
I want the user to create only documents like this:
<data name="data2">
<value id="123" name="valueA" />
<value id="456" name="valueB" />
<value id="789" name="valueC" />
</data>
So I want to define special attribute pairs in my DTD, like ' the value attribute id="123" works only with the attribute name="valueA"! '
Is it possible to do so ?
Thanx a lot,
Findus