Declaring Handlers

Some of these are from XML::Parser::Expat, some added from XML::Parser.

Handlers
A hash table; key values are event names {Init, Final, Start, End, Char, Proc, Comment, Default, Unparsed, Notation, ExternEnt, Entity, Element, Attlist, Doctype, XMLDecl}. Each key's value is a subroutine reference which handles that event. Not all events must be declared.
use XML::Parser;
$xml = "<tag1>..<tag2>..</tag2>..</tag1>";
$parser = new XML::Parser(
           Handlers => { Start => \&start_tag,
                         End   => \&end_tag } );
$parser->parse($xml);
sub start_tag { print "<$_[1]>\n"; }
sub end_tag   { print "</$_[1]>\n"; }
<tag1>
<tag2>
</tag2>
</tag1>
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