Yet another SXML serializer

Hello!

I implemented another SXML-to-XML and SXML-to-HTML serializer. The goal 
behind this activity is moving towards compatibility with the W3C XSLT and 
XQuery Serialization:
http://www.w3.org/TR/2005/CR-xslt-xquery-serialization-20051103/

Current features of the SXML serializer implemented:
 - Outputting an SXML document as XML and HTML
 - Returning the serialized document as a string or displaying it to an 
output port
 - Support for (S)XML namespaces
 - Support for indentation on user demand to facilitate document readability 
by a human
 - Support for '& entities produced by HtmlPrag
 - Support for serialization parameters like cdata-section-elements

TODO:
 - Escape URI attributes in HTML output method
 - Do not insert additional whitespaces adjacent to HTML %inline elements in 
HTML output method

Examples:
http://modis.ispras.ru/Lizorkin/sxml-tutorial.html#hevea:serializ

The implementation is still of a beta quality, but should be quite usable.

The serializer is committed to ssax.sf.net CVS. You can also download it 
here:
 - SXML serializer as a standalone module:
http://modis.ispras.ru/Lizorkin/Download/Tmp/serializer.scm
(requires `cond-expand' from SRFI-0 and `filter' from SRFI-1)
or
 - SXML serializer as a part of SSAX-SXML package, for Bigloo, Chicken, 
Gambit and PLT:
http://modis.ispras.ru/Lizorkin/download.html

Your feedback is appreciated; in particular, I am interested in hearing your 
opinion about additional features you consider important/convenient for the 
SXML serializer to support.

Dmitry




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