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Re: Namespace class for Pointers in RDF

From: Shadi Abou-Zahra <shadi@w3.org>
Date: Mon, 01 Sep 2008 16:40:33 +0200
Message-ID: <48BBFEE1.3040100@w3.org>
To: Carlos Iglesias <carlos.iglesias@fundacionctic.org>
CC: public-wai-ert@w3.org

Hi Carlos,

This is an important point, thank you for raising it!

It seems that XPointer expressions use URI references, and that IRI 
references need to be escaped into URI references:
  - <http://www.w3.org/TR/2003/REC-xptr-framework-20030325/#escaping>

It may be best to adopt this approach as well. We could keep the term 
'namespaceURI' intentionally, to signal that the namespaces should be 
URI references. Additionally, we should adopt the definition and point 
readers to the XPointer specification for more background.

On the other hand, if we decide to use IRI references directly then we 
will need to consider the impact of it for the RDF/XML serialization of 
pointers and therefore also for EARL reports.


Carlos Iglesias wrote:
> Hi group,
> Currently the Namespace class consists of:
> Namespace (ptr:prefix, ptr:namespaceURI)
> We created the Namespace class to be able to indicate namespaces for XPath and XPointer expressions, so our usage is limited to XML Namespacing, and thus I think we should name the class XMLNamespace to distinguish it from other namespacing mechanisms.
> Additionally, XML 1.0 makes use of URIs for the namespace identification [1], but XML 1.1 use IRIs with the same purpose [2]. So, if we use a namespaceURI property we are somehow restricting the usage of the vocabulary with XML 1.1
> The options are using a namespaceIRI property instead, as it is a superset of URIs (my only concern is that the term is far less "popular"), or a more generic name for the property (e.g. namespaceName as in the specification)
> So the class could look like:
> XMLNamespace (ptr:prefix, ptr:namespaceName)
> Do you have any thoughts about this?
> [1] - [http://www.w3.org/TR/xml-names/#concepts]
> [2] - [http://www.w3.org/TR/xml-names11/#concepts]
> Regards,
>  CI.
> ____________________
> Carlos Iglesias
> Fundación CTIC
> Parque Científico-Tecnológico de Gijón
> 33203 - Gijón, Asturias, España
> teléfono: +34 984291212
> email: carlos.iglesias@fundacionctic.org
> URL: http://www.fundacionctic.org 

Shadi Abou-Zahra - http://www.w3.org/People/shadi/ |
   WAI International Program Office Activity Lead   |
  W3C Evaluation & Repair Tools Working Group Chair |
Received on Monday, 1 September 2008 14:41:11 UTC

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