XML parsing memory overhead concerns

Clark C. Evans clark.evans at manhattanproject.com
Fri Dec 17 08:13:17 GMT 1999

Thanks James.  I think I got it.  You use the 
expat events to build the queue, and the use
the call-backs to process the queue.  When
the queue is empty, you ask expat to load
the queue with the next chunk of the source.
This should work like a charm -- and in a 
single thread.   

Oh How Pretty! 


On Fri, 17 Dec 1999, James Clark wrote:
> "Clark C. Evans" wrote:
> > Anyway, given a SAX event source, pushing
> > the entire document his way, I don't see
> > how a single threaded solution is possible.
> > 
> > And, from the expat declaration of setElementHandler,
> > which requires both a StartElementHandler and an
> > EndElementHandler, I assumed that expat works in
> > a similar (if not identical) manner.
> Expat doesn't work like SAX.  Clark Cooper has written a nice article
> explaining expat's API:
>   http://www.xml.com/pub/1999/09/expat/index.html
> With SAX, the application calls parse once per document; the parser
> makes a call on an InputStream to get each chunk of input.  With expat,
> the parser doesn't make any calls to get input; rather the application
> calls XML_Parse() arbitrarily many times for a single document, each
> time passing it another chunk of the input.
> James

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