What is $e within XSP?

[Christopher H. Laco]

I'm looking for more info what exactly what $e is and what it contains 
in the context of writing a taglib:

  sub parse_start {
    my ($e, $tag, %attr) = @_;
  };
I know AxKit is based on SAX which is basically start/end tag events. Is 
there any look-ahead in SAX?

Basically, I'm trying to find out in one start tag, what the next tag 
is. Let's say I have an optional tag that will be used to filter the 
results normally loadedin the base tag:

        <mytag>
                <myfiltertag>
        </mytag>
        vs.
        <mytag>
        </mytag>
When spitting out the underlying code, when <myfiltertag> is supplied, I 
would postpone any setup work in <mytag> until </myfiltertag> end event.
When <myfiltertag> is left out, I need to do the setup work right awayin 
<mytag>.

As <mytag> may contan many other tags, I can't just wait until the 
</mytag> event.

This problem is even more complicated if <mytag> is a looper since 
typically <mytag> would do the first hald of the 'for $x (@y) {' code 
and the </mytag> code would finish it with '};'.

<myfiltertag> could alter @y on the fly, but that really means I've 
still have to load @y twice. If would be more efficient if <mytag> knew 
it have a <myfiltertag> child and let </myfiltertag> take car of loading 
@y and starting the 'for $x (@y) {' code block.

Thanks,
-=Chris
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