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

Re: Using ID's usefully ?

  • From: "John E. Simpson" <simpson@p...>
  • To: xml-dev@i...
  • Date: Fri, 21 May 1999 00:18:01 -0400

re using products
At 07:57 PM 05/20/1999 -0700, Winton Davies wrote:
>...I hope the problem is clear: Principled re-use of ID's, and 
>ELEMENT TYPING of ID's. 

I didn't really understand what you were trying to do. But now seems
perfectly natural to me to use attributes for IDs, although I was confused
about them myself at first. As I've come to understand it, an ID doesn't
uniquely identify content (that is, the "thing" that the document
represents). It uniquely identifies an occurrence of an *element* (that is,
a piece of the markup).

>It seems strange the only way to use IDREF's 
>is in attributes (especially as there is no default "value" (c.f "id" 
>for ID) ATTRIBUTE, nor a way to specify the ELEMENT TYPE of IDREF one 
>may have).

The idea of a default value for an ID attribute is attractive to me; my DTD
specifies numerous elements that can occur only once in the tree, and I
wanted to declare defaults for all of these. When I raised the "Why not?"
question on xml-dev a few months back, it was conceded that in a case like
this, defaults might be useful, but the general feeling was that this
wasn't a typical case. The point was moot anyhow: XML 1.0 just doesn't
allow it.

>Also - how does one specify multiply IDREFS ? <tag attr1="1" 
>attr1="2"> or something else ?

Separate them with spaces: <tag attr1="1 2">

==========================================================
John E. Simpson            | The secret of eternal youth
simpson@p...        | is arrested development.
http://www.flixml.org      |  -- Alice Roosevelt Longworth

xml-dev: A list for W3C XML Developers. To post, mailto:xml-dev@i...
Archived as: http://www.lists.ic.ac.uk/hypermail/xml-dev/ and on CD-ROM/ISBN 981-02-3594-1
To (un)subscribe, mailto:majordomo@i... the following message;
(un)subscribe xml-dev
To subscribe to the digests, mailto:majordomo@i... the following message;
subscribe xml-dev-digest
List coordinator, Henry Rzepa (mailto:rzepa@i...)


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.