XML::NamespaceSupport - a simple generic namespace support class


  use XML::NamespaceSupport;
  my $nsup = XML::NamespaceSupport->new;
  # add a new empty context
  # declare a few prefixes
  $nsup->declare_prefix($prefix1, $uri1);
  $nsup->declare_prefix($prefix2, $uri2);
  # the same shorter
  $nsup->declare_prefixes($prefix1 => $uri1, $prefix2 => $uri2);
  # get a single prefix for a URI (randomly)
  $prefix = $nsup->get_prefix($uri);
  # get all prefixes for a URI (probably better)
  @prefixes = $nsup->get_prefixes($uri);
  # get all prefixes in scope
  @prefixes = $nsup->get_prefixes();
  # get all prefixes that were declared for the current scope
  @prefixes = $nsup->get_declared_prefixes;
  # get a URI for a given prefix
  $uri = $nsup->get_uri($prefix);
  # get info on a qname (java-ish way, it's a bit weird)
  ($ns_uri, $local_name, $qname) = $nsup->process_name($qname, $is_attr);
  # the same, more perlish
  ($ns_uri, $prefix, $local_name) = $nsup->process_element_name($qname);
  ($ns_uri, $prefix, $local_name) = $nsup->process_attribute_name($qname);
  # remove the current context
  # reset the object for reuse in another document
  # a simple helper to process Clarkian Notation
  my ($ns, $lname) = $nsup->parse_jclark_notation('{http://foo}bar');
  # or (given that it doesn't care about the object
  my ($ns, $lname) = XML::NamespaceSupport->parse_jclark_notation('{http://foo}bar');


This module offers a simple to process namespaced XML names (unames) from within any application that may need them. It also helps maintain a prefix to namespace URI map, and provides a number of basic checks.

The model for this module is SAX2's NamespaceSupport class, readable at It adds a few perlisations where we thought it appropriate.


All methods of the interface have an alias that is the name used in the original Java specification. You can use either name interchangeably. Here is the mapping:

  Java name                 Perl name
  pushContext               push_context
  popContext                pop_context
  declarePrefix             declare_prefix
  declarePrefixes           declare_prefixes
  getPrefix                 get_prefix
  getPrefixes               get_prefixes
  getDeclaredPrefixes       get_declared_prefixes
  getURI                    get_uri
  processName               process_name
  processElementName        process_element_name
  processAttributeName      process_attribute_name
  parseJClarkNotation       parse_jclark_notation
  undeclarePrefix           undeclare_prefix


Two global variables are made available to you. They used to be constants but simple scalars are easier to use in a number of contexts. They are not exported but can easily be accessed from any package, or copied into it.


 - add more tests
 - optimise here and there


Robin Berjon,, with lots of it having been done by Duncan Cameron, and a number of suggestions from the perl-xml list.


Copyright (c) 2001-2005 Robin Berjon. All rights reserved. This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.