RE: Error Code XQ0058

Hi Jonathan,

I had not noticed that the latest draft (July 2004)
allows for multiple location hints in schema import 
statements. Thanks for clarifying this.

Panagiotis

> -----Original Message-----
> From: Jonathan Robie [mailto:jonathan.robie@datadirect.com]
> Sent: Saturday, August 14, 2004 9:50 AM
> To: Panagiotis Reveliotis
> Cc: public-qt-comments@w3.org
> Subject: Re: Error Code XQ0058
> 
> 
> Panagiotis Reveliotis wrote:
> 
> > In "XQuery 1.0: An XML Query Language" / F Summary of Error 
> Conditions (Non-Normative),
> > it is stated that:
> > 
> > err:XQ0058
> > 
> >     It is a static error if multiple schema imports specify 
> the same target namespace.
> > 
> > I am wondering why is this considered an error, given that 
> XML Schema allows for more than
> > one schema files to have the same targetNamespace. In fact, 
> it allows for multiple schemas
> > sharing the same targetNamespace to be combined using the 
> include mechanism. 
> 
> Hi Panagiotis,
> 
> First, I'm going to treat this as a question unless you tell 
> me that you 
> want to raise an issue on this subject.
> 
> Each XQuery implementation has its own way of locating schema 
> documents. 
>   A schema import tells the implementation to import the schema for a 
> given target namespace - this schema may consist of any 
> number of schema 
> documents (which you refer to as 'schema file'). The schema that is 
> imported includes all the schema documents the implementation 
> finds for 
> that namespace - so there's nothing left to import.
> 
> In this model, the schema location is only a hint, and schema 
> import for 
>   a given schema happens all at once. Multiple locations may 
> be given as 
> hints in a single import.
> 
> This is, of course, different from the approach taken in XML 
> Schema and 
> in several programming languages.
> 
> Is this clear? Do you have concerns about this approach?
> 
> Jonathan
> 
>