1XML::NamespaceSupport(3U)ser Contributed Perl DocumentatiXoMnL::NamespaceSupport(3)
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NAME

6       XML::NamespaceSupport - A simple generic namespace processor
7

VERSION

9       version 1.12
10

SYNOPSIS

12         use XML::NamespaceSupport;
13         my $nsup = XML::NamespaceSupport->new;
14
15         # add a new empty context
16         $nsup->push_context;
17         # declare a few prefixes
18         $nsup->declare_prefix($prefix1, $uri1);
19         $nsup->declare_prefix($prefix2, $uri2);
20         # the same shorter
21         $nsup->declare_prefixes($prefix1 => $uri1, $prefix2 => $uri2);
22
23         # get a single prefix for a URI (randomly)
24         $prefix = $nsup->get_prefix($uri);
25         # get all prefixes for a URI (probably better)
26         @prefixes = $nsup->get_prefixes($uri);
27         # get all prefixes in scope
28         @prefixes = $nsup->get_prefixes();
29         # get all prefixes that were declared for the current scope
30         @prefixes = $nsup->get_declared_prefixes;
31         # get a URI for a given prefix
32         $uri = $nsup->get_uri($prefix);
33
34         # get info on a qname (java-ish way, it's a bit weird)
35         ($ns_uri, $local_name, $qname) = $nsup->process_name($qname, $is_attr);
36         # the same, more perlish
37         ($ns_uri, $prefix, $local_name) = $nsup->process_element_name($qname);
38         ($ns_uri, $prefix, $local_name) = $nsup->process_attribute_name($qname);
39
40         # remove the current context
41         $nsup->pop_context;
42
43         # reset the object for reuse in another document
44         $nsup->reset;
45
46         # a simple helper to process Clarkian Notation
47         my ($ns, $lname) = $nsup->parse_jclark_notation('{http://foo}bar');
48         # or (given that it doesn't care about the object
49         my ($ns, $lname) = XML::NamespaceSupport->parse_jclark_notation('{http://foo}bar');
50

DESCRIPTION

52       This module offers a simple to process namespaced XML names (unames)
53       from within any application that may need them. It also helps maintain
54       a prefix to namespace URI map, and provides a number of basic checks.
55
56       The model for this module is SAX2's NamespaceSupport class, readable at
57       http://www.saxproject.org/namespaces.html It adds a few perlisations
58       where we thought it appropriate.
59

NAME

61       XML::NamespaceSupport - a simple generic namespace support class
62

METHODS

64       ·   XML::NamespaceSupport->new(\%options)
65
66           A simple constructor.
67
68           The options are "xmlns", "fatal_errors", and "auto_prefix"
69
70           If "xmlns" is turned on (it is off by default) the mapping from the
71           xmlns prefix to the URI defined for it in DOM level 2 is added to
72           the list of predefined mappings (which normally only contains the
73           xml prefix mapping).
74
75           If "fatal_errors" is turned off (it is on by default) a number of
76           validity errors will simply be flagged as failures, instead of
77           die()ing.
78
79           If "auto_prefix" is turned on (it is off by default) when one
80           provides a prefix of "undef" to "declare_prefix" it will generate a
81           random prefix mapped to that namespace. Otherwise an undef prefix
82           will trigger a warning (you should probably know what you're doing
83           if you turn this option on).
84
85           If "xmlns_11" us turned off, it becomes illegal to undeclare
86           namespace prefixes. It is on by default. This behaviour is
87           compliant with Namespaces in XML 1.1, turning it off reverts you to
88           version 1.0.
89
90       ·   $nsup->push_context
91
92           Adds a new empty context to the stack. You can then populate it
93           with new prefixes defined at this level.
94
95       ·   $nsup->pop_context
96
97           Removes the topmost context in the stack and reverts to the
98           previous one. It will die() if you try to pop more than you have
99           pushed.
100
101       ·   $nsup->declare_prefix($prefix, $uri)
102
103           Declares a mapping of $prefix to $uri, at the current level.
104
105           Note that with "auto_prefix" turned on, if you declare a prefix
106           mapping in which $prefix is undef(), you will get an automatic
107           prefix selected for you. If it is off you will get a warning.
108
109           This is useful when you deal with code that hasn't kept prefixes
110           around and need to reserialize the nodes. It also means that if you
111           want to set the default namespace (i.e. with an empty prefix) you
112           must use the empty string instead of undef. This behaviour is
113           consistent with the SAX 2.0 specification.
114
115       ·   $nsup->declare_prefixes(%prefixes2uris)
116
117           Declares a mapping of several prefixes to URIs, at the current
118           level.
119
120       ·   $nsup->get_prefix($uri)
121
122           Returns a prefix given a URI. Note that as several prefixes may be
123           mapped to the same URI, it returns an arbitrary one. It'll return
124           undef on failure.
125
126       ·   $nsup->get_prefixes($uri)
127
128           Returns an array of prefixes given a URI. It'll return all the
129           prefixes if the uri is undef.
130
131       ·   $nsup->get_declared_prefixes
132
133           Returns an array of all the prefixes that have been declared within
134           this context, ie those that were declared on the last element, not
135           those that were declared above and are simply in scope.
136
137           Note that at least one context must be added to the stack via
138           "push_context" before this method can be called.
139
140       ·   $nsup->get_uri($prefix)
141
142           Returns a URI for a given prefix. Returns undef on failure.
143
144       ·   $nsup->process_name($qname, $is_attr)
145
146           Given a qualified name and a boolean indicating whether this is an
147           attribute or another type of name (those are differently affected
148           by default namespaces), it returns a namespace URI, local name,
149           qualified name tuple. I know that that is a rather abnormal list to
150           return, but it is so for compatibility with the Java spec. See
151           below for more Perlish alternatives.
152
153           If the prefix is not declared, or if the name is not valid, it'll
154           either die or return undef depending on the current setting of
155           "fatal_errors".
156
157       ·   $nsup->undeclare_prefix($prefix);
158
159           Removes a namespace prefix from the current context. This function
160           may be used in SAX's end_prefix_mapping when there is fear that a
161           namespace declaration might be available outside their scope (which
162           shouldn't normally happen, but you never know ;) ). This may be
163           needed in order to properly support Namespace 1.1.
164
165       ·   $nsup->process_element_name($qname)
166
167           Given a qualified name, it returns a namespace URI, prefix, and
168           local name tuple. This method applies to element names.
169
170           If the prefix is not declared, or if the name is not valid, it'll
171           either die or return undef depending on the current setting of
172           "fatal_errors".
173
174       ·   $nsup->process_attribute_name($qname)
175
176           Given a qualified name, it returns a namespace URI, prefix, and
177           local name tuple. This method applies to attribute names.
178
179           If the prefix is not declared, or if the name is not valid, it'll
180           either die or return undef depending on the current setting of
181           "fatal_errors".
182
183       ·   $nsup->reset
184
185           Resets the object so that it can be reused on another document.
186
187       All methods of the interface have an alias that is the name used in the
188       original Java specification. You can use either name interchangeably.
189       Here is the mapping:
190
191         Java name                 Perl name
192         ---------------------------------------------------
193         pushContext               push_context
194         popContext                pop_context
195         declarePrefix             declare_prefix
196         declarePrefixes           declare_prefixes
197         getPrefix                 get_prefix
198         getPrefixes               get_prefixes
199         getDeclaredPrefixes       get_declared_prefixes
200         getURI                    get_uri
201         processName               process_name
202         processElementName        process_element_name
203         processAttributeName      process_attribute_name
204         parseJClarkNotation       parse_jclark_notation
205         undeclarePrefix           undeclare_prefix
206

VARIABLES

208       Two global variables are made available to you. They used to be
209       constants but simple scalars are easier to use in a number of contexts.
210       They are not exported but can easily be accessed from any package, or
211       copied into it.
212
213       ·   $NS_XMLNS
214
215           The namespace for xmlns prefixes, http://www.w3.org/2000/xmlns/.
216
217       ·   $NS_XML
218
219           The namespace for xml prefixes,
220           http://www.w3.org/XML/1998/namespace.
221

TODO

223        - add more tests
224        - optimise here and there
225

SEE ALSO

227       XML::Parser::PerlSAX
228

AUTHORS

230       ·   Robin Berjon <robin@knowscape.com>
231
232       ·   Chris Prather <chris@prather.org>
233
235       This software is copyright (c) 2015 by Robin Berjon.
236
237       This is free software; you can redistribute it and/or modify it under
238       the same terms as the Perl 5 programming language system itself.
239

CONTRIBUTORS

241       ·   Chris Prather <cprather@hdpublishing.com>
242
243       ·   David Steinbrunner <dsteinbrunner@pobox.com>
244
245       ·   Paul Cochrane <paul@liekut.de>
246
247       ·   Paulo Custodio <pauloscustodio@gmail.com>
248
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251perl v5.28.1                      2017-03-30          XML::NamespaceSupport(3)
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