XML::Filter::Dispatcher 0.52

XML::Filter::Dispatcher is a path based event dispatching with DOM support.

SYNOPSIS

use XML::Filter::Dispatcher qw( :all );

my $f = XML::Filter::Dispatcher->new(
Rules => [
foo => &handle_foo_start_tag,
@bar => &handle_bar_attr,

## Send any elts and their contents to $handler
snarf//self::node() => $handler,

## Print the text of all elements
description
=> [ string() => sub { push @out, xvalue } ],
],

Vars => {
"id" => [ string => "12a" ],
},
);

WARNING: Beta code alert.

A SAX2 filter that dispatches SAX events based on "EventPath" patterns as the SAX events arrive. The SAX events are not buffered or converted to an in-memory document representation like a DOM tree. This provides for low lag operation because the actions associated with each pattern are executed as soon as possible, usually in an elements start_element() event method.

This differs from traditional XML pattern matching tools like XPath and XSLT (which is XPath-based) which require the entire document to be built in memory (as a "DOM tree") before queries can be executed. In SAX terms, this means that they have to build a DOM tree from SAX events and delay pattern matching until the end_document() event method is called.