On 01/03/2022 23:52, Michael Kay wrote:
> Orthogonality, or to put it another way, avoiding arbitrary
> restrictions. If ID and IDREF are going to be among your set of data
> types, then why would you want to disallow people from using them on
> elements.
It's part of the way some people view XML. I struggle to find any use
case for using ID or IDREF on elements. In fact, I would argue that
adding an ID or IDREF attribute to an element type *is* "using it on
elements".
> (Personally, I would have made "IDness" and "IDREFness" properties
> that are orthogonal to type. I can't see any good reason for
> disallowing IDs of type integer or date.
If we accept IDs must be unique within the document, I have encountered
many reasons, such as "integers" that aren't (ie leading zeroes), and
dates that turn out later to need multiple occurrences.
> But the SGML and DTD legacy weighed strongly on the XSD designers.)
I am very glad they did.
Peter
>> On 1 Mar 2022, at 23:32, Roger L Costello <> wrote:
>>
>> Hi Folks,
>>
>> DTD only allows attributes to be of type ID and IDREF.
>>
>> XML Schema allows both attributes and elements to be of type ID and IDREF. Why? Is there a compelling use case for declaring an element to be of type ID? Is there a compelling use case for declaring an element to be of type IDREF?
>>
>> /Roger
>>
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>
>
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--
Peter Flynn
Cork 🇮🇪 Ireland 🇪🇺
