[Snow-users-list] SXML/SSAX (second try)
    Kirill Lisovsky 
    k_lisovsky at yahoo.com
       
    Sun Jul 15 23:39:52 EDT 2007
    
    
  
Hello,
I've a plan to snowball refactored SSAX-SXML package.
It'll likely include the following components:
  1. XML parsing - SSAX, W3C compliant
  2. HTML parsing - Neil van Dyke's HtmlPrag 
  3. SXPath - including full support for W3C XPath syntax and 
     location-step functions in Scheme. Provides expressive power of XQuery. 
  4. SXLink - W3C compliant, but without support for points and ranges
  5. XQuery Update Facility - no XQuery, just updates with Patrick Lehti syntax
  6. XSLT-like transformation - but XSLT compatibility is unlikely 
  7. Descriptive XML schema - DataGuides 
  8. Serialization to XML and HTML, including pretty printing
  9. ... and more :-)
Almost all of the code exists and is used in production for years, so it's mostly about 
refactoring/optimization/better packaging/easy of use.
API would be streamlined and much smaller comparing to current SSAX-SXML
packages. 
The package is currently developed and deployed as Chicken egg, but it should
also  support Bigloo, Gambit and PLT, and Snow looks like a reasonable way to achieve this. 
The latest Chicken package at SourceForge 
  http://sourceforge.net/project/showfiles.php?group_id=30687&package_id=192751
provides very similar functionality.
We collaborate with Dmitry Lizorkin, and this package may be considered as
a lightweight and streamlined version of the packages maintained by him.
 It's worth a note that packaging SSAX as a separate package is quite possible
and even may be a good idea. In the past SXML-tools and SSAX were packaged 
as two separate packages, but SXML-tools heavily depended on SSAX because 
SSAX package included "common library" code, such as string processing and 
even I/O. The code is very portable but it even comes with its own "local" SRFI-13 :-)
I'd love to change this with Snow!
So, hopefully, with Snow this support code may be moved out of 
SSAX, and SSAX-SXML package may be decomposed as three different
packages:
   1. SSAX
   2. SSAX-independent SXML-tools
   3. Other SXML-tools (such as SXLink), this package depends on two others.  
If you are interested in snowballing SSAX - please let me know, Dmitry and I 
will be glad to collaborate.
Best regards,
         Kirill Lisovsky.
 
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