John Cowan wrote:

> Misha Wolf scripsit:
>
> > This:
> > http://www.iptc.org/docs/newscodes.html#123456
> > is not legal, as "123456" is an illegal fragment identifier.
>
> Not exactly. We can decompose this into three claims, two false
> and one true.
>
> 1) "123456" is an invalid fragment: false. If you look at the
> syntax rules in RFC 3986, you see that every character in a
> fragment can be a digit.
>
> 2) "123456" can't be the value of an XML attribute of type ID:
> false. An XML document may contain attributes of type ID in one
> of two ways: every attribute with the name "xml:id" is of type ID,
> and so is any attribute declared in the DTD (internal or external)
> to have type ID. Such attributes may contain any value, and the
> document is well-formed.
>
> 3) "123456" can't be the value of an attribute of type ID in a
> *valid* XML document: true. However, plenty of documents are not
> valid: in particular, any document without a DTD is not valid, and
> there is nothing wrong with having a DTD without expecting or
> requiring validity.

I'm out of my depth here. At the W3C AC meeting in Edinburgh, last
year, I understood Henry to be stating that something like:

http://www.iptc.org/docs/newscodes.html#123456

is not legal, as "123456" is an illegal fragment identifier. It may
be that the resulting XML document is legal, but that the use in
(X)HTML is illegal?

Misha Wolf
News Standards Manager, Reuters, http://www.reuters.com/
Vice Chair, News Architecture WP, IPTC, http://www.iptc.org/

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