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

Re: ANN: XML Schema: DOs and DON'Ts

  • From: Eddie Robertsson <eddie@a...>
  • To: Kohsuke KAWAGUCHI <kohsukekawaguchi@y...>
  • Date: Fri, 18 May 2001 11:21:12 +1000

xsd sequence arbitrary order
> > On a side issue: Why does this constaint on restriction apply to <xsd:all> and
> > <xsd:choice> groups? It's logical for <xsd:sequence> since the sequence is
> > important but in <xsd:choice> and <xsd:all> the order is insignificant.
>
> I guess there is a computational difficulty issue involved. Otherwise
> it's just an error somehow survived the reviews.
>
> It becomes very hard to check that a given <all> is a proper subset of
> another <all> if you allow arbitrary order of items. If <all> has x items,
> then you have to check x^2 times in the worst case.

You're correct. I found this in the spec [1].

"NOTE: Although the ·validation· semantics of an all group does not depend on the
order of its particles, derived all groups are required to match the order of their
base in order to simplify checking that the derivation is OK."

Cheers,
/Eddie

[1] http://www.w3.org/TR/xmlschema-1/#rcase-Recurse


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.