Re: [xml] sax + startElement

[Daniel Veillard <veillard redhat com>]

[Re Cc'ing the list since the informations may be useful for others and worth
 archiving, Daniel]

On Fri, Feb 09, 2007 at 05:46:07PM +0100, Jovan Kostovski wrote:
> On 2/9/07, Daniel Veillard <veillard redhat com> wrote:
> >  I would suggest to avoid SAX unless you have critical performance
> >requirements, it will make your code 10 times easier to maintain if
> >you use the reader instead:
> >   http://xmlsoft.org/xmlreader.html
> 
> That's the reason why I tried usung SAX. I have to write a parser that will
> work on embedded computer. It has a 200 MHz CPU with 128MB RAM
> but there will be some big configuration files in (xml format) to handle.
> The compiled code size matters too.
> I saw from the examples that XMLReader is much more cleaner and easier
> to use, but what are the system resouces needed comparing to SAX.
> Since XMLReader is an interface to SAX2 it needs more memory, right?

  Perfectly right, that one of the few use case where using SAX makes sense,
I would still try to use SAX version 2 though it's a bit more complex, the
parser is faster, does more (namespace handling), and requires less allocation
at run time.
  The main change are Element start and end callbacks, see 
    http://xmlsoft.org/html/libxml-SAX2.html#xmlSAX2StartElementNs
    http://xmlsoft.org/html/libxml-SAX2.html#xmlSAX2EndElementNs
you need a special magic version in SAX
    http://xmlsoft.org/html/libxml-parser.html#XML_SAX2_MAGIC

see for example 
    static xmlSAXHandler debugSAX2HandlerStruct 
in testSAX.c in the source distribution,

Daniel

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