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   Re: [xml-dev] Creating a Complex System using XSLT. Step 1: CreateFeedb

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Roger L. Costello wrote:

> That leads me to another question - is feedback generally applied to the
> "data" or to the "process"?

Feedback is part of the processing of the data.  Think of an electronic 
amplifier.  The unmodified input signal is the data, the amplifier 
provides a transformation of that signal to create the output.  Thus, 
the stylesheet would be analogous to the amplifier (or other electronic 

With feedback, a part of the input signal is taken from the output.  If 
the feedback adds linearly to the input, and the feedback portion of the 
output is linear, the system is a lot easier to analyze than if there is 

Thinking about an xslt transformation, its functional design should 
prevent feeding back part of the output to the input.  Once the input 
has been read, it cannot be changed so far as the particular 
transformation is concerned.  Thus, xslt operates somewhat analgously 
(is that a word??) to an open loop amplifier.

So it would seem that to simulate fedback behavior using xslt, you would 
need some kind of supervisor sitting outside the stylesheet, capable of 
routing both its output and the original input to another 
transformation.  Could that supervisor also be a stylesheet?  I doubt it 
but maybe someone else could be clever enough.


Tom P


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