Provided by: libxml-namespacesupport-perl_1.12-2_all 
NAME
XML::NamespaceSupport - A simple generic namespace processor
VERSION
version 1.12
SYNOPSIS
use XML::NamespaceSupport;
my $nsup = XML::NamespaceSupport->new;
# add a new empty context
$nsup->push_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
$nsup->pop_context;
# reset the object for reuse in another document
$nsup->reset;
# a simple helper to process Clarkian Notation
my ($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');
DESCRIPTION
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
http://www.saxproject.org/namespaces.html It adds a few perlisations where we thought it
appropriate.
NAME
XML::NamespaceSupport - a simple generic namespace support class
METHODS
• XML::NamespaceSupport->new(\%options)
A simple constructor.
The options are "xmlns", "fatal_errors", and "auto_prefix"
If "xmlns" is turned on (it is off by default) the mapping from the xmlns prefix to
the URI defined for it in DOM level 2 is added to the list of predefined mappings
(which normally only contains the xml prefix mapping).
If "fatal_errors" is turned off (it is on by default) a number of validity errors will
simply be flagged as failures, instead of die()ing.
If "auto_prefix" is turned on (it is off by default) when one provides a prefix of
"undef" to "declare_prefix" it will generate a random prefix mapped to that namespace.
Otherwise an undef prefix will trigger a warning (you should probably know what you're
doing if you turn this option on).
If "xmlns_11" us turned off, it becomes illegal to undeclare namespace prefixes. It is
on by default. This behaviour is compliant with Namespaces in XML 1.1, turning it off
reverts you to version 1.0.
• $nsup->push_context
Adds a new empty context to the stack. You can then populate it with new prefixes
defined at this level.
• $nsup->pop_context
Removes the topmost context in the stack and reverts to the previous one. It will
die() if you try to pop more than you have pushed.
• $nsup->declare_prefix($prefix, $uri)
Declares a mapping of $prefix to $uri, at the current level.
Note that with "auto_prefix" turned on, if you declare a prefix mapping in which
$prefix is undef(), you will get an automatic prefix selected for you. If it is off
you will get a warning.
This is useful when you deal with code that hasn't kept prefixes around and need to
reserialize the nodes. It also means that if you want to set the default namespace
(i.e. with an empty prefix) you must use the empty string instead of undef. This
behaviour is consistent with the SAX 2.0 specification.
• $nsup->declare_prefixes(%prefixes2uris)
Declares a mapping of several prefixes to URIs, at the current level.
• $nsup->get_prefix($uri)
Returns a prefix given a URI. Note that as several prefixes may be mapped to the same
URI, it returns an arbitrary one. It'll return undef on failure.
• $nsup->get_prefixes($uri)
Returns an array of prefixes given a URI. It'll return all the prefixes if the uri is
undef.
• $nsup->get_declared_prefixes
Returns an array of all the prefixes that have been declared within this context, ie
those that were declared on the last element, not those that were declared above and
are simply in scope.
Note that at least one context must be added to the stack via "push_context" before
this method can be called.
• $nsup->get_uri($prefix)
Returns a URI for a given prefix. Returns undef on failure.
• $nsup->process_name($qname, $is_attr)
Given a qualified name and a boolean indicating whether this is an attribute or
another type of name (those are differently affected by default namespaces), it
returns a namespace URI, local name, qualified name tuple. I know that that is a
rather abnormal list to return, but it is so for compatibility with the Java spec. See
below for more Perlish alternatives.
If the prefix is not declared, or if the name is not valid, it'll either die or return
undef depending on the current setting of "fatal_errors".
• $nsup->undeclare_prefix($prefix);
Removes a namespace prefix from the current context. This function may be used in
SAX's end_prefix_mapping when there is fear that a namespace declaration might be
available outside their scope (which shouldn't normally happen, but you never know ;)
). This may be needed in order to properly support Namespace 1.1.
• $nsup->process_element_name($qname)
Given a qualified name, it returns a namespace URI, prefix, and local name tuple. This
method applies to element names.
If the prefix is not declared, or if the name is not valid, it'll either die or return
undef depending on the current setting of "fatal_errors".
• $nsup->process_attribute_name($qname)
Given a qualified name, it returns a namespace URI, prefix, and local name tuple. This
method applies to attribute names.
If the prefix is not declared, or if the name is not valid, it'll either die or return
undef depending on the current setting of "fatal_errors".
• $nsup->reset
Resets the object so that it can be reused on another document.
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
VARIABLES
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.
• $NS_XMLNS
The namespace for xmlns prefixes, http://www.w3.org/2000/xmlns/.
• $NS_XML
The namespace for xml prefixes, http://www.w3.org/XML/1998/namespace.
TODO
- add more tests
- optimise here and there
SEE ALSO
XML::Parser::PerlSAX
AUTHORS
• Robin Berjon <robin@knowscape.com>
• Chris Prather <chris@prather.org>
COPYRIGHT AND LICENSE
This software is copyright (c) 2015 by Robin Berjon.
This is free software; you can redistribute it and/or modify it under the same terms as
the Perl 5 programming language system itself.
CONTRIBUTORS
• Chris Prather <cprather@hdpublishing.com>
• David Steinbrunner <dsteinbrunner@pobox.com>
• Paul Cochrane <paul@liekut.de>
• Paulo Custodio <pauloscustodio@gmail.com>