Re: [xml] What is the advantage of a Reader vs a Parser?

[BJ Chippindale <bchippindale networkAdvantage biz>]

Thanks - I was wondering if I was on the right track and I am made wiser
by listening.

I started suspecting the problem after the 800th line of code (and only
half done).  The context information in my application is quite dense
but I have no significant reason to worry about the memory itself, the
whole message is only about 800-1000 characters.  The variations were
killing me.

respectfully
BJ

On Thu, 2004-04-01 at 10:50, Kevin P. Fleming wrote:
> BJ Chippindale wrote:
>
> > It also appears that if the XML is a control message in which the
> > meaning of lower levels depends on the context set in upper ones, the
> > reader is inconvenient.  Message "state" information has to be retained
> > and/or discarded for each node as it is processed.  For example:  An
> > address that is a "destination" is not treated the same as a "source"
> > but the node name is identical. So I have to retain state information
> > throughout the processing and it quickly becomes intractably dense code
> > (Which is why I started exploring the parsing in the first instance).  
> > It appears that the standard parsing model is better suited to this sort
> > of work, as the context is implicit in the position on the tree.  
>
> This is classic state-machine programming, and you are right, it is more 
> work up front than using an XML "parser". However, if the documents you 
> are dealing with are large enough for memory consumption to matter, it 
> can make a large difference in the app's memory usage.
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