> SAX is a huge advance over the XML::Parser Handler API for a

Thanks for the expose. I'll wax a bit.

 >  - pluggable - if your code is written to the SAX API you
 >    can use any SAX parser without changing your code

Not immediately useful to me, since expat is the only library currently 
ported (and bundle-able) to every OS I need it to be in (my software is one 
of the rare few that turns into a "don't need Perl installed" application 
for Mac and Windows).

 >  - flexible - your data source does not even need to be an
 >    XML document (eg: you can drive your SAX pipeline from
 >    a database query

That's kinda neat, although I do some pre-processing before sending to 
XML::Simple - enough so that I'm always sending a string of XML, not a file.

 > I'm not entirely clear on what you're trying to do with
 > namespaces.  Do you want your hashref keys to be in Clarkian
 > notation eg: '{http://purl.org/dc/elements/1.1/}date' or
 > do you want to normalise the prefixes used eg: 'dc:date'?

Nope, not really. The biggest problem is:

  - I assume my data is going to be in one data structure, but
    if someone prefixes the data with a namespace besides the
    implied default, I get a different structure that breaks
    my assumption:

     assuming:
      <item> <dc:title>boo</dc:title></item>
      == $item-> {dc:title}

     breaks my thingy:
      <item> <dublincore:title>boo</dublincore:title></item>
      != $item-> {dc:title} but rather $item->{dublinecore:title}

In my case, my plan was to preparse the list of
namespaces in an XML document. So, if I had:

  xmlns:crazymother="http://purl.org/dc/elements/1.1/"

I'd store it as $namespaces{http://purl.org/dc/elements/1.1/} = 
"crazymother" or some such. There'd be a subroutine that'd return the 
prefix (pseudo):

  sub get_namespace_prefix {
    my ($url) = @_; return $namespaces{$url} || undef;
  }

With that, I'd be able to then do, in my code:

  my $dc_prefix = get_ns_url("http://purl.org/dc/elements/1.1/");
  if ($dc_prefix) {
     print "Dublin Core Title: $item-> {"$dc_prefix:title"};
  }


-- 
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