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RE: Update an existing element in a result tree?

From: Kay, Michael <Michael.Kay@softwareag.com>
Date: Mon, 22 Sep 2003 12:22:22 +0200
Message-ID: <DFF2AC9E3583D511A21F0008C7E62106073DD136@daemsg02.software-ag.de>
To: "Roger L. Costello" <costello@mitre.org>, public-qt-comments@w3.org
XSLT is a declarative, functional language: the concept of updating
variables, or nodes in a tree, is therefore alien. The form of your question
"as my stylesheet executes..." shows that you are thinking in a procedural
model. Please try to rethink your problem description so that the result
tree can be described as a function of the source tree.

Michael Kay

> -----Original Message-----
> From: Roger L. Costello [mailto:costello@mitre.org] 
> Sent: 18 September 2003 21:43
> To: public-qt-comments@w3.org; Costello,Roger L.
> Subject: Update an existing element in a result tree?
> Suppose that at some point in the execution of a stylesheet 
> this element is added to the result tree:
> <Member count="1"/>
> Later on in the execution of the stylesheet something is 
> encountered that causes it to want to update that Member 
> element in the result tree so that count is incremented by 1, 
> i.e., the result tree should be updated so that the Member 
> element now looks like this:
> <Member count="2"/>
> This may occur many times.  Each time the Member element in 
> the result tree is updated.
> Recap: As my stylesheet executes I want it to add things into 
> a result tree, and then as it executes further I want it to 
> update things that were previously placed in the result tree. 
> By the time the processor has completed executing the 
> stylesheet the result tree has undergone all desired 
> additions and updates, and is then serialized.
> Would someone please explain how to do this?  /Roger
Received on Monday, 22 September 2003 06:22:40 UTC

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