[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message]

Re: XQuery types was Re: Yet another plea for XUpdat


Re:  XQuery types was Re:  Yet another plea for XUpdat
At 10:12 AM 5/4/2002 -0700, Dare Obasanjo wrote:
>The bottom line is that any XML database product that
>supports XQuery and W3C XML schema plus an update
>capability will have to support post-update validation
>because the XQuery and W3C XML Schema "type" systems
>leave the door open for too many things to be dynamic.
>
>
>By the way here are some quotes from the Formal
>Semantics document which point out what I mean by
>validation vs. type system

[ !!! SNIP !!!]

>Especially with regards to restriction facets, there
>simply is no way for this to be implemented without
>something akin to post-update validation. Identity
>constraints as well. In fact, when I think about even
>making sure that the results of an update do not
>result in an invalid content model for an element in
>the document is pretty much another validation issue
>not a type one.

Static analysis is not an all-or-nothing thing. Relational databases do not 
use static analysis for constraints on values, but static analysis is 
important for relational databases.

Restriction facets are generally constraints on values.

Jonathan


PURCHASE STYLUS STUDIO ONLINE TODAY!

Purchasing Stylus Studio from our online shop is Easy, Secure and Value Priced!

Buy Stylus Studio Now

Download The World's Best XML IDE!

Accelerate XML development with our award-winning XML IDE - Download a free trial today!

Don't miss another message! Subscribe to this list today.
Email
First Name
Last Name
Company
Subscribe in XML format
RSS 2.0
Atom 0.3
 

Stylus Studio has published XML-DEV in RSS and ATOM formats, enabling users to easily subcribe to the list from their preferred news reader application.


Stylus Studio Sponsored Links are added links designed to provide related and additional information to the visitors of this website. they were not included by the author in the initial post. To view the content without the Sponsor Links please click here.

Site Map | Privacy Policy | Terms of Use | Trademarks
Free Stylus Studio XML Training:
W3C Member
Stylus Studio® and DataDirect XQuery ™are products from DataDirect Technologies, is a registered trademark of Progress Software Corporation, in the U.S. and other countries. © 2004-2013 All Rights Reserved.