Booth, David (HP Software - Boston) scripsit:

> I'm confused by your point #3 below, as it seems to be implying that a
> document without a DTD could legitimately have an attribute of type ID
> with value "123456", and after looking at the specs I don't see how it
> can. Did I miss something? Detailed analysis below.

An xml:id processor will report a constraint violation when it sees
"xml:id='123456'" in an element, but it will perform ID type assignment
anyway, as noted in Section 4 of the xml:id Recommendation.

In addition, a conformant XML processor must report an attribute declared
to be of type ID as having that type, no matter what the value may be.
For example, the document:

<!DOCTYPE items [
<!ATTLIST item id ID #IMPLIED>
]>
<items>
<item id="123456">...</item>
...
</items>

is not valid, but the id attribute of the item element is of type ID.
So you can use either xml:id or a (possibly partial) DTD to force
an attribute to be of type ID, and ignore any xml:id or validation errors.

Neither of these devices is available in valid XHTML documents, of course.

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