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RE: IRIs everywhere (including XML namespaces)

From: Jonathan Marsh <jmarsh@microsoft.com>
Date: Thu, 10 Oct 2002 15:16:09 -0700
Message-ID: <330564469BFEC046B84E591EB3D4D59C080CEB20@red-msg-08.redmond.corp.microsoft.com>
To: "Elliotte Rusty Harold" <elharo@metalab.unc.edu>, <www-tag@w3.org>

I agree.  None of these have normative references to IRIs, but try to
incorporate the primary concept that users do not perform %-escaping
prior to inserting the IRI into an XML document, but that the processor
applies %-escaping when needed to interface with a component requiring a
strict URI.

I also think your careful reading of XLink role and arcrole descriptions
is correct; my mistake.  But it is my recollection that we tried to make
role and arcrole consistent with href, which the wording does not
express.  I'll ask the XLink group to search their memories.  In the
meantime, it would be useful to hear the TAG opinion on whether using
URIs instead of IRIs in role and arcrole attributes was a mistake.

> -----Original Message-----
> From: Elliotte Rusty Harold [mailto:elharo@metalab.unc.edu]
> Sent: Thursday, October 10, 2002 8:43 AM
> To: Jonathan Marsh; www-tag@w3.org
> Subject: Re: IRIs everywhere (including XML namespaces)
> 
> At 9:09 AM -0700 10/9/02, Jonathan Marsh wrote:
> 
> >Some examples of IRI use:
> 
> Let's look at each of these to see how widespread IRI really are.
> 
> >- XML 1.0 system identifiers [2]
> 
> This references an erratum, not the actual spec. The original 1st
> edition spec is clear though that what we now call an IRI is allowed;
> that the escaping is performed by the processor as necessary, not the
> author.
> 
> >- XInclude href attribute [3]
> 
> This is accurate, though the XInclude spec references an old IURI
> draft from 2000 rather than the current draft. Presumably this will
> be fixed in the next draft.
> 
> >- XLink href attribute [4]
> 
> XLink does not reference or use IRIs but it does define an
> essentially equivalent escaping procedure.
> 
> >- XLink role and arcrole attributes [5]
> 
> This is not accurate. The XLink spec is clear that illegal characters
> must be escaped before their insertion in the role and arcrole
> attributes:
> 
> The value of the role or arcrole attribute must be a URI reference as
> defined in [IETF RFC 2396], except that if the URI scheme used is
> allowed to have absolute and relative forms, the URI portion must be
> absolute. The URI reference identifies some resource that describes
> the intended property. When no value is supplied, no particular role
> value is to be inferred. Disallowed URI reference characters in these
> attribute values must be specially encoded as described in 5.4
> Locator Attribute (href).
> 
> 
> >- XML Schema anyURI datatype [6]
> >
> 
> This is based on the algorithm used for the href attribute of XLinks,
> so this is  effectively an IRI, though like XLInk it does not use the
> word "IRI" directly. It does non-normatively reference an expired
> 2001 draft IRI spec in the references section only (as far as I
> noticed).
> --
> 
> +-----------------------+------------------------+-------------------+
> | Elliotte Rusty Harold | elharo@metalab.unc.edu | Writer/Programmer |
> +-----------------------+------------------------+-------------------+
> |          XML in a  Nutshell, 2nd Edition (O'Reilly, 2002)          |
> |              http://www.cafeconleche.org/books/xian2/              |
> |  http://www.amazon.com/exec/obidos/ISBN%3D0596002920/cafeaulaitA/  |
> +----------------------------------+---------------------------------+
> |  Read Cafe au Lait for Java News:  http://www.cafeaulait.org/      |
> |  Read Cafe con Leche for XML News: http://www.cafeconleche.org/    |
> +----------------------------------+---------------------------------+
Received on Thursday, 10 October 2002 18:16:53 GMT

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