Re: [xml] export DOM tree with SAX interface

[Daniel Veillard <veillard redhat com>]

On Fri, Mar 29, 2002 at 04:51:36PM +0100, Fernand Albarracin wrote:
> Hi Daniel, hi libxml people,
> 
> I need a special feature that I believe is not present in libxml right
> now. Searching in the list archive, I found the following post under the
> subject "[xml] libxml2/sax/write-back" (2002/02/06) :
[..]
> >   Well, no there isn't any "inverted SAX" which would reserialize
> > a stream of event, it's somewhere deep in the TODO list. It's relatively
> > simple but I didn't had the time to do this.
> > 
> > Daniel
> 
> I guess you were refering to the following entry of the TODO file :
> 
> # - jamesh suggestion: SAX like functions to save a document ie. call a
> #   function to open a new element with given attributes, write character
> #   data, close last element, etc

  Right,

> I need something similar. Then, as I understand libxml, there are two
> ways to achieve this :
> 
> A. xmlDocDumpMemory() + xmlSAXUserParseMemory()

  Hum, braindead, sorry :-)

> B. traverse the tree with functions similar to
> xmlDocContentDumpOutput(), xmlNodeDumpOutput() and
> xmlNodeListDumpOutput() but instead of writing to a xmlOutputBuffer,
> these would call user-supplied callbacks (from a xmlSAXHandler)
> 
> Right ?

  Right

> Obviously A is not efficient. Worse : it's not The Right Thing (tm).  :)

  Clearly not the right thing.

> Is there a better approach ?

  No it's how I would do myself. It should not be very difficult
look at the existing serialization code and replace all the routines
to save to the buffer by their SAX counterpart.

> I haven't done any serious work with
> libxml, am I missing some really important aspects of its achitecture ?

  No, it sounds right,

Daniel

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