On Aug 9, 2012, at 5:17 AM, [email protected] wrote:

> I read somewhere that I can write s-expressions for substituting xml files. 
> Is there any tutorial?


There are several different libraries for manipulating XML via S-expressions: 

1. http://docs.racket-lang.org/xml/index.html?q=xml
Look for the subsection on X-expressions and conversion to/from XML. 
This library is lightweight but covers a lot of basic needs. 
Also see the web-server's use of this library. 

2. http://planet.racket-lang.org/display.ss?package=sxml2.plt&owner=clements
The SXML representation is for manipulations that require some sophistication 
but also look for sxml at http://planet.racket-lang.org/

3. http://planet.racket-lang.org/display.ss?package=xml.plt&owner=bzlib
Help converting bewteen xexpr and sxml, as well as helpers 
for reading and writing sxml and xexpr.

And if you continue to look on Planet for XML you will find many more. 

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