RE: Potential new issue: PSVI considered harmful

I'm very interested in seeing coherent arguments against the usage of the PSVI 
in XQuery and XPath 2.0 (which isn't the same thing as using W3C XML Schema 
primitives in both languages even though that is also the case here). 
 
I recently was asked to summarize the arguments against the inclusions of the 
PSVI in XQuery and XPath 2.0 from the XML-DEV lists[0] and although there was a 
lot of rhetoric most of it boiled down to what seemed primarily to be personal 
dislike of W3C XML Schema and worries of implementation complexity. Now given 
that one of the major concerns was XPath 2.0 which allows implementers to use 
both a flexible type exception policy with fallback rules[1] as well as the 
consideration that static typing may be optional, it seems that some of the 
fears in the 150 - 200 posts about XPath 2.0, XQuery and the PSVI may have been 
allayed. 
 

[0] http://lists.xml.org/archives/xml-dev/200205/threads.html The threads 
entitled (i) How to spell "No PSVI" in XSLT 2.0 ? (ii) Objections to / uses of 
PSVI? (iii) XSLT 2.0 and XSL(-FO) 2.0 (iv) XSLT 2.0 / XPath 2.0 - Assumptions 
(v) PSVI formalization (vi) XPath 1.5 

[1] http://www.w3.org/TR/2002/WD-xpath20-20020430/#static_context

[2] http://www.w3.org/TR/2002/WD-xpath20-20020430/#N40047D 
<http://www.w3.org/TR/xpath20/#N40047D> 

        -----Original Message----- 
        From: Simon St.Laurent [mailto:simonstl@xxxxxxxxxxxx] 
        Sent: Wed 6/12/2002 12:21 PM 
        To: www-tag@xxxxxx 
        Cc: 
        Subject: Re: Potential new issue: PSVI considered harmful
        
        


        At 11:13 AM 6/12/2002 -0700, Tim Bray wrote:
        >4. Work on XQuery and other things that require a Type-Augmented 
Infoset
        >must not depend on schema processing, and should not have normative
        >linkages to any schema language specifications.
        
        I'd say this item is a crucial requirement if the W3C wants to avoid a
        serious fork in XML development.  Efforts to impose the PSVI as part of 
the
        XML core are not very welcome in a lot of places.
        
        I'm well aware that's a political issue, but the impact on what 
constitutes
        Web Architecture seems real enough.
        
        Simon St.Laurent
        "Every day in every way I'm getting better and better." - Emile Coue