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Re: idref()

Subject: Re: idref()
From: "G. Ken Holman" <gkholman@xxxxxxxxxxxxxxxxxxxx>
Date: Tue, 04 May 1999 14:32:02 -0400
xsl idref referenced
At 99/05/04 16:26 +0200, Bovone Stefano wrote:
>May I have an example of how I can use idref() ?

Below is another page excerpted from the handouts of my XSLT tutorial next
Tuesday at WWW8 in Toronto.

I hope this helps.

......... Ken

Module 10: Advanced Expressions and Transformation
Lesson 2: Cross Referencing Techniques

Element Referencing

Recall that element nodes in the source node tree can have unique
identifiers defined by the presence of XML attributes of type ID. It is a
common practice to implement cross referencing from other elements using
XML attributes of type IDREF that point to the unique identifiers of
elements with the corresponding ID attribute.

A stylesheet can obtain an element node by its unique identifier through
the following functions:

· the id() function converts its argument to a string and either returns a
node set with a single member being that element node with the unique
identifier being equal to the string, or returns an empty node set if the
string argument is empty or there is no element with a unique identifier
being equal to the argument

· the idref() function converts each node of its node-set argument into a
string of whitespace separated tokens and with the resulting union of
tokens builds a return node set being the set of all element nodes whose
unique identifier is in the set of tokens 

These functions can be used stand-alone or as a step in a multiple-step
location path of an expression:

· id("buyer") returns the element whose unique identifier is the string
value "buyer"

· id(1) returns the element whose unique identifier is the string value "1"

· idref(@where) returns the element whose unique identifier is the same
value as the value of the where= attribute of the current node

· idref(@where)/phone[2] returns the second phone child element of the
element whose unique identifier is the same value as the value of the
where= attribute of the current node

· idref(//@where)/phone[2] returns the set of the second phone child
elements of all elements referenced by any use of the where= attribute of
any element node in the instance

+//ISBN 1-894049::CSL::Courses::PFUX//DOCUMENT An Introduction to XSLT
1999-05-04 14:00//EN
The Eighth International World Wide Web Conference
May 11, 1999
Page 183

Copyright © Crane Softwrights Ltd.

G. Ken Holman                  mailto:gkholman@xxxxxxxxxxxxxxxxxxxx
Crane Softwrights Ltd.           http://www.CraneSoftwrights.com/s/
Box 266, Kars, Ontario CANADA K0A-2E0  +1(613)489-0999  (Fax:-0995)
Website: XSL/XML/DSSSL/SGML services outline,  XSL/DSSSL shareware,
         stylesheet resource library, conference training schedule,
         commercial stylesheet training materials, on-line XSL CBT.
Next instructor-led XSLT Training:                  WWW8:1999-05-11

 XSL-List info and archive:  http://www.mulberrytech.com/xsl/xsl-list

Current Thread
  • idref()
    • Bovone Stefano - Tue, 4 May 1999 16:26:49 +0200
      • G. Ken Holman - Tue, 04 May 1999 14:32:02 -0400 <=
      • Message not available
      • <Possible follow-ups>
      • DPawson - Wed, 5 May 1999 16:11:12 +0100


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