I'd like to pre-announce the diploma work of Evgeni Milenin (Saint-
Petersburg State University, 2007):

XPath over S-expressions
The title describes the work in full

The diploma text (sorry, only in Russian):
http://xmlhack.ru/protva/Xpath_over_Sexp.pdf

A short English readme file, together with the library, can be found
in the directory "ffi-sexp" in the Generative XPath distribution
package:

http://sourceforge.net/project/showfiles.php?group_id=138946&package_...

At the moment, the library works under Guile only. But with small
additions to cond-expand, it should work under any R5RS-compliant
Scheme implementation, which supports integers of arbitrary length.

The work is based on Generative XPath:

``Generative XPath is an XPath 1.0 implementation, which can be
adapted to different hierarchical memory structures and different
programming languages. It is based on a small, easy to implement
virtual machine, which is already available for different platforms,
including plain C, Java and .NET.''

XML Prague 2007 paper, slides, download:

http://xmlhack.ru/protva/prague07-generative-xpath.pdf
http://xmlhack.ru/protva/prague07-generative-xpath-slides.pdf
http://sourceforge.net/project/showfiles.php?group_id=138946&package_...