SAX Parser best practise

Hi Jan,

I have a question regarding best practise in setting up a XML parser
within R. [snip]
value="445.598999"/> (as one can see in the xml snip set)

I missed the xml snip, but I think I get the gist of your question.

I know the mechanism of using Event Handlers, as shown in the
examples.  But what I'm looking for is, how can I use some "path
information" as mentioned in "addContext" parameter of
xmlEventParse()? May somebody share a example using "addContext =
TRUE" and pointing me to the variables I may use if I implement the
"..." parameter within my handlers.

Do I have to implement a "status machine" using some variables
within my handlers, or would one prefer to use the "state" parameter
of xmlEventParse()?

I'm not familiar with the addContext arg and don't know whether or not
that provides another solution to your problem.

I do know that you can do what you want by writing "state machine"
code.  I played a little with using the state arg for this purpose,
but ran into some problems (sorry, no details in my memory banks).

There is an example of the state approach in Bioconductor's AnnBuilder
package.  See R/GO.R.  It isn't the prettiest or best example, but
maybe it will help get you going.

The general approach is to use '<<-' to reach up a level and set the
state variables from inside the tag handlers.

HTH,

+ seth