[xsl] Design approaches to separating "pure" code from "impure" code?

Hi Folks,

This is a general design question. 

First, let me define some terms:

I define "pure" code as code that doesn't do any I/O.

I define "impure" code as code that does I/O.

(Dimitre could probably provide better definitions of those terms)

I am seeking your suggestions on ways to organize XSLT code to keep pure code 
and impure code separate.

/Roger

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