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Re: IRIs everywhere (including XML namespaces)

From: Elliotte Rusty Harold <elharo@metalab.unc.edu>
Date: Thu, 10 Oct 2002 11:43:28 -0400
Message-Id: <p04330104b9cb4d054b80@[192.168.254.4]>
To: "Jonathan Marsh" <jmarsh@microsoft.com>, <www-tag@w3.org>

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 |
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|          XML in a  Nutshell, 2nd Edition (O'Reilly, 2002)          |
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|  http://www.amazon.com/exec/obidos/ISBN%3D0596002920/cafeaulaitA/  |
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Received on Thursday, 10 October 2002 11:45:14 GMT

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