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RE: Calculating cumulative values - Abel's solution

Subject: RE: Calculating cumulative values - Abel's solution
From: Wendell Piez <wapiez@xxxxxxxxxxxxxxxx>
Date: Fri, 31 Aug 2007 16:22:54 -0400
RE:  Calculating cumulative values - Abel's solution
At 02:14 PM 8/31/2007, you wrote:
One day I'll understand the lingo!  What I meant was that I was hoping the
output would be identical to the input except for the addition of the new
cumulative attributes y2 and y3.  Is this called an "identity
transformation"?

Simon,


An identity transformation is one in which the output is identical to the input, with allowances made for changes that aren't supposed to count, such as the order of attributes. In other words, "tag fidelity" is not required, but as far as the XML document-as-tree is concerned, you get out just what you put in.

While pure identity transforms are sometimes useful (for example, you may want to transcode character sets), it is much more common to want your output to be nearly identical, not perfectly identical, to your input, and indeed such transformations are very common in XSLT. This describes your case exactly.

These transformations commonly use the "identity template" -- which is one or another variant of a template that copies a node into the output, and then applies templates to its children (those who haven't memorized it can find it easily on the web) -- plus one or two other templates to introduce just the changes wanted. For this reason, these transforms are often called "identity transforms" although strictly speaking, they might be better described as "near-identity transforms" or "modified copying transforms".

Cheers,
Wendell



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Wendell Piez                            mailto:wapiez@xxxxxxxxxxxxxxxx
Mulberry Technologies, Inc.                http://www.mulberrytech.com
17 West Jefferson Street                    Direct Phone: 301/315-9635
Suite 207                                          Phone: 301/315-9631
Rockville, MD  20850                                 Fax: 301/315-8285
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  Mulberry Technologies: A Consultancy Specializing in SGML and XML
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