Any hints on characterizing the minimal memory requirement of XSLT style

The problem is as following:
Given an XSLT stylesheet s, and the schema of the XML documents,
how much memory is necessary to evaluate the transformation s?

Does anyone have some solid solution?
Or if you can list some materials, including books and articles,
I will be much grateful to you.

zhimao

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