This file is indexed.

/usr/share/perl5/XML/LibXML/Simple.pod is in libxml-libxml-simple-perl 0.93-1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
=head1 NAME

XML::LibXML::Simple - XML::LibXML clone of XML::Simple::XMLin()

=head1 INHERITANCE

 XML::LibXML::Simple
   is a Exporter

=head1 SYNOPSIS

  use XML::LibXML::Simple   qw(XMLin);
  my $xml = XMLin <xml file or string>, OPTIONS;

Or the Object Oriented way:

  use XML::LibXML::Simple   ();
  my $xs = XML::LibXML::Simple->new(OPTIONS);
  my $ref = $xs->XMLin(<xml file or string>, OPTIONS);

=head1 DESCRIPTION

This module is a blunt rewrite of XML::Simple (by Grant McLean) to
use the XML::LibXML parser for XML structures, where the original
uses plain Perl or SAX parsers.

=head1 METHODS

=head2 Constructors

=over 4

=item XML::LibXML::Simple-E<gt>B<new>(OPTIONS)

Instantiate an object, which can be used to call L<XMLin()|XML::LibXML::Simple/"Translators"> on.  You can
provide OPTIONS to this constructor (to be reused for each call to XMLin)
and with each call of XMLin (to be used once)

For XML-DATA and descriptions of the OPTIONS see the L</DETAILS>
section of this manual page.

=back

=head2 Translators

=over 4

=item $obj-E<gt>B<XMLin>(XML-DATA, OPTIONS)

For XML-DATA and descriptions of the OPTIONS see the L</DETAILS>
section of this manual page.

=back

=head1 FUNCTIONS

The functions C<XMLin> (exported implictly) and C<xml_in>
(exported on request) simply call C<<XML::LibXML::Simple->new->XMLin() >>
with the provided parameters.

=head1 DETAILS

=head2 Differences with XML::Simple

In general, the output and the options are equivalent, although this
module has some differences with XML::Simple to be aware of.

=over 4

=item only L<XMLin()|XML::LibXML::Simple/"Translators"> is supported

If you want to write XML then use a schema (for instance with
XML::Compile). Do not attempt to create XML by hand!  If you still
think you need it, then have a look at XMLout() as implemented by
XML::Simple or any of a zillion template systems.

=item no "variables" option

IMO, you should use a templating system if you want variables filled-in
in the input: it is not a task for this module.

=item empty elements are not removed

Being empty has a meaning which should not be ignored.

=item ForceArray options

There are a few small differences in the result of the C<forcearray> option,
because XML::Simple seems to behave inconsequently.

=back

=head2 Parameter XML-DATA

As first parameter to L<XMLin()|XML::LibXML::Simple/"Translators"> must provide the XML message to be
translated into a Perl structure.  Choose one of the following:

=over 4

=item A filename

If the filename contains no directory components, C<XMLin()> will look for the
file in each directory in the SearchPath (see OPTIONS below) and in the
current directory.  eg:

  $ref = XMLin('/etc/params.xml');

Note, the filename C<< - >> (dash) can be used to parse from STDIN.

=item undef

If there is no XML specifier, C<XMLin()> will check the script directory and
each of the SearchPath directories for a file with the same name as the script
but with the extension '.xml'.  Note: if you wish to specify options, you
must specify the value 'undef'.  eg:

  $ref = XMLin(undef, ForceArray => 1);

=item A string of XML

A string containing XML (recognised by the presence of '<' and '>' characters)
will be parsed directly.  eg:

  $ref = XMLin('<opt username="bob" password="flurp" />');

=item An IO::Handle object

An IO::Handle object will be read to EOF and its contents parsed. eg:

  $fh = IO::File->new('/etc/params.xml');
  $ref = XMLin($fh);

=back

=head2 OPTIONS

L<XML::LibXML::Simple|XML::LibXML::Simple> supports most options defined by XML::Simple, so
the interface is quite compatible.  Minor changes apply.  This explanation
is extracted from the XML::Simple manual-page.

=over 4

=item *

check out C<ForceArray> because you'll almost certainly want to turn it on

=item *

make sure you know what the C<KeyAttr> option does and what its default
value is because it may surprise you otherwise.

=item *

Option names are case in-sensitive so you can use the mixed case versions
shown here; you can add underscores between the words (eg: key_attr)
if you like.

=back

In alphabetic order:

=over 4

=item ContentKey => 'keyname' I<# seldom used>

When text content is parsed to a hash value, this option let's you specify a
name for the hash key to override the default 'content'.  So for example:

  XMLin('<opt one="1">Two</opt>', ContentKey => 'text')

will parse to:

  { one => 1, text => 'Two' }

instead of:

  { one => 1, content => 'Two' }

You can also prefix your selected key name with a '-' character to have 
C<XMLin()> try a little harder to eliminate unnecessary 'content' keys after
array folding.  For example:

  XMLin(
    '<opt><item name="one">First</item><item name="two">Second</item></opt>', 
    KeyAttr => {item => 'name'}, 
    ForceArray => [ 'item' ],
    ContentKey => '-content'
  )

will parse to:

  {
     item => {
      one =>  'First'
      two =>  'Second'
    }
  }

rather than this (without the '-'):

  {
    item => {
      one => { content => 'First' }
      two => { content => 'Second' }
    }
  }

=item ForceArray => 1 I<# important>

This option should be set to '1' to force nested elements to be represented
as arrays even when there is only one.  Eg, with ForceArray enabled, this
XML:

    <opt>
      <name>value</name>
    </opt>

would parse to this:

    { name => [ 'value' ] }

instead of this (the default):

    { name => 'value' }

This option is especially useful if the data structure is likely to be written
back out as XML and the default behaviour of rolling single nested elements up
into attributes is not desirable. 

If you are using the array folding feature, you should almost certainly
enable this option.  If you do not, single nested elements will not be
parsed to arrays and therefore will not be candidates for folding to a
hash.  (Given that the default value of 'KeyAttr' enables array folding,
the default value of this option should probably also have been enabled
as well).

=item ForceArray => [ names ] I<# important>

This alternative (and preferred) form of the 'ForceArray' option allows you to
specify a list of element names which should always be forced into an array
representation, rather than the 'all or nothing' approach above.

It is also possible to include compiled regular
expressions in the list --any element names which match the pattern
will be forced to arrays.  If the list contains only a single regex,
then it is not necessary to enclose it in an arrayref.  Eg:

  ForceArray => qr/_list$/

=item ForceContent => 1 I<# seldom used>

When C<XMLin()> parses elements which have text content as well as attributes,
the text content must be represented as a hash value rather than a simple
scalar.  This option allows you to force text content to always parse to
a hash value even when there are no attributes.  So for example:

  XMLin('<opt><x>text1</x><y a="2">text2</y></opt>', ForceContent => 1)

will parse to:

  {
    x => {         content => 'text1' },
    y => { a => 2, content => 'text2' }
  }

instead of:

  {
    x => 'text1',
    y => { 'a' => 2, 'content' => 'text2' }
  }

=item GroupTags => { grouping tag => grouped tag } I<# handy>

You can use this option to eliminate extra levels of indirection in your Perl
data structure.  For example this XML:

  <opt>
   <searchpath>
     <dir>/usr/bin</dir>
     <dir>/usr/local/bin</dir>
     <dir>/usr/X11/bin</dir>
   </searchpath>
 </opt>

Would normally be read into a structure like this:

  {
    searchpath => {
       dir => [ '/usr/bin', '/usr/local/bin', '/usr/X11/bin' ]
    }
  }

But when read in with the appropriate value for 'GroupTags':

  my $opt = XMLin($xml, GroupTags => { searchpath => 'dir' });

It will return this simpler structure:

  {
    searchpath => [ '/usr/bin', '/usr/local/bin', '/usr/X11/bin' ]
  }

The grouping element (C<< <searchpath> >> in the example) must not contain any
attributes or elements other than the grouped element.

You can specify multiple 'grouping element' to 'grouped element' mappings in
the same hashref.  If this option is combined with C<KeyAttr>, the array
folding will occur first and then the grouped element names will be eliminated.

=item KeepRoot => 1 I<# handy>

In its attempt to return a data structure free of superfluous detail and
unnecessary levels of indirection, C<XMLin()> normally discards the root
element name.  Setting the 'KeepRoot' option to '1' will cause the root element
name to be retained.  So after executing this code:

  $config = XMLin('<config tempdir="/tmp" />', KeepRoot => 1)

You'll be able to reference the tempdir as
C<$config-E<gt>{config}-E<gt>{tempdir}> instead of the default
C<$config-E<gt>{tempdir}>.

=item KeyAttr => [ list ] I<# important>

This option controls the 'array folding' feature which translates nested
elements from an array to a hash.  It also controls the 'unfolding' of hashes
to arrays.

For example, this XML:

    <opt>
      <user login="grep" fullname="Gary R Epstein" />
      <user login="stty" fullname="Simon T Tyson" />
    </opt>

would, by default, parse to this:

    {
      user => [
         { login    => 'grep',
           fullname => 'Gary R Epstein'
         },
         { login    => 'stty',
           fullname => 'Simon T Tyson'
         }
      ]
    }

If the option 'KeyAttr => "login"' were used to specify that the 'login'
attribute is a key, the same XML would parse to:

    {
      user => {
         stty => { fullname => 'Simon T Tyson' },
         grep => { fullname => 'Gary R Epstein' }
      }
    }

The key attribute names should be supplied in an arrayref if there is more
than one.  C<XMLin()> will attempt to match attribute names in the order
supplied.

Note 1: The default value for 'KeyAttr' is C<< ['name', 'key', 'id'] >>.
If you do not want folding on input or unfolding on output you must
setting this option to an empty list to disable the feature.

Note 2: If you wish to use this option, you should also enable the
C<ForceArray> option.  Without 'ForceArray', a single nested element will be
rolled up into a scalar rather than an array and therefore will not be folded
(since only arrays get folded).

=item KeyAttr => { list } I<# important>

This alternative (and preferred) method of specifiying the key attributes
allows more fine grained control over which elements are folded and on which
attributes.  For example the option 'KeyAttr => { package => 'id' } will cause
any package elements to be folded on the 'id' attribute.  No other elements
which have an 'id' attribute will be folded at all. 

Two further variations are made possible by prefixing a '+' or a '-' character
to the attribute name:

The option 'KeyAttr => { user => "+login" }' will cause this XML:

    <opt>
      <user login="grep" fullname="Gary R Epstein" />
      <user login="stty" fullname="Simon T Tyson" />
    </opt>

to parse to this data structure:

    {
      user => {
         stty => {
            fullname => 'Simon T Tyson',
            login    => 'stty'
         },
         grep => {
            fullname => 'Gary R Epstein',
            login    => 'grep'
         }
      }
    }

The '+' indicates that the value of the key attribute should be copied
rather than moved to the folded hash key.

A '-' prefix would produce this result:

    {
      user => {
         stty => {
            fullname => 'Simon T Tyson',
            -login   => 'stty'
         },
         grep => {
            fullname => 'Gary R Epstein',
            -login    => 'grep'
         }
      }
    }

=item NoAttr => 1 I<# handy>

When used with C<XMLin()>, any attributes in the XML will be ignored.

=item NormaliseSpace => 0 | 1 | 2 I<# handy>

This option controls how whitespace in text content is handled.  Recognised
values for the option are:

=over 4

=item "0"

(default) whitespace is passed through unaltered (except of course for the
normalisation of whitespace in attribute values which is mandated by the XML
recommendation)

=item "1"

whitespace is normalised in any value used as a hash key (normalising means
removing leading and trailing whitespace and collapsing sequences of whitespace
characters to a single space)

=item "2"

whitespace is normalised in all text content

=back

Note: you can spell this option with a 'z' if that is more natural for you.

=item Parser => OBJECT

You may pass your own XML::LibXML object, in stead of having one
created for you. This is useful when you need specific configuration
on that object (See XML::LibXML::Parser) or have implemented your
own extension to that object.

The internally created parser object is configured in safe mode.
Read the XML::LibXML::Parser manual about security issues with
certain parameter settings.  The default is unsafe!

=item ParserOpts => HASH|ARRAY

Pass parameters to the creation of a new internal parser object. You
can overrule the options which will create a safe parser. It may be more
readible to use the C<Parser> parameter.

=item SearchPath => [ list ] I<# handy>

If you pass C<XMLin()> a filename, but the filename include no directory
component, you can use this option to specify which directories should be
searched to locate the file.  You might use this option to search first in the
user's home directory, then in a global directory such as /etc.

If a filename is provided to C<XMLin()> but SearchPath is not defined, the
file is assumed to be in the current directory.

If the first parameter to C<XMLin()> is undefined, the default SearchPath
will contain only the directory in which the script itself is located.
Otherwise the default SearchPath will be empty.  

=item ValueAttr => [ names ] I<# handy>

Use this option to deal elements which always have a single attribute and no
content.  Eg:

  <opt>
    <colour value="red" />
    <size   value="XXL" />
  </opt>

Setting C<< ValueAttr => [ 'value' ] >> will cause the above XML to parse to:

  {
    colour => 'red',
    size   => 'XXL'
  }

instead of this (the default):

  {
    colour => { value => 'red' },
    size   => { value => 'XXL' }
  }

=item NsExpand => 0  I<advised>

When name-spaces are used, the default behavior is to include the
prefix in the key name.  However, this is very dangerous: the prefixes
can be changed without a change of the XML message meaning.  Therefore,
you can better use this C<NsExpand> option.  The downside, however, is
that the labels get very long.

Without this option:

  <record xmlns:x="http://xyz">
    <x:field1>42</x:field1>
  </record>
  <record xmlns:y="http://xyz">
    <y:field1>42</y:field1>
  </record>

translates into

  { 'x:field1' => 42 }
  { 'y:field1' => 42 }

but both source component have exactly the same meaning.  When C<NsExpand>
is used, the result is:

  { '{http://xyz}field1' => 42 }
  { '{http://xyz}field1' => 42 }

Of course, addressing these fields is more work.  It is advised to implement
it like this:

  my $ns = 'http://xyz';
  $data->{"{$ns}field1"};

=item NsStrip => 0 I<sloppy coding>

[not available in XML::Simple]
Namespaces are really important to avoid name collissions, but they are
a bit of a hassle.  To do it correctly, use option C<NsExpand>.  To do
it sloppy, use C<NsStrip>.  With this option set, the above example will
return

  { field1 => 42 }
  { field1 => 42 }

=back

=head1 EXAMPLES

When C<XMLin()> reads the following very simple piece of XML:

    <opt username="testuser" password="frodo"></opt>

it returns the following data structure:

    {
      username => 'testuser',
      password => 'frodo'
    }

The identical result could have been produced with this alternative XML:

    <opt username="testuser" password="frodo" />

Or this (although see 'ForceArray' option for variations):

    <opt>
      <username>testuser</username>
      <password>frodo</password>
    </opt>

Repeated nested elements are represented as anonymous arrays:

    <opt>
      <person firstname="Joe" lastname="Smith">
        <email>joe@smith.com</email>
        <email>jsmith@yahoo.com</email>
      </person>
      <person firstname="Bob" lastname="Smith">
        <email>bob@smith.com</email>
      </person>
    </opt>

    {
      person => [
        { email     => [ 'joe@smith.com', 'jsmith@yahoo.com' ],
          firstname => 'Joe',
          lastname  => 'Smith'
        },
        { email     => 'bob@smith.com',
          firstname => 'Bob',
          lastname  => 'Smith'
        }
      ]
    }

Nested elements with a recognised key attribute are transformed (folded) from
an array into a hash keyed on the value of that attribute (see the C<KeyAttr>
option):

    <opt>
      <person key="jsmith" firstname="Joe" lastname="Smith" />
      <person key="tsmith" firstname="Tom" lastname="Smith" />
      <person key="jbloggs" firstname="Joe" lastname="Bloggs" />
    </opt>

    {
      person => {
         jbloggs => {
            firstname => 'Joe',
            lastname  => 'Bloggs'
         },
         tsmith  => {
            firstname => 'Tom',
            lastname  => 'Smith'
         },
         jsmith => {
            firstname => 'Joe',
            lastname => 'Smith'
         }
      }
    }

The <anon> tag can be used to form anonymous arrays:

    <opt>
      <head><anon>Col 1</anon><anon>Col 2</anon><anon>Col 3</anon></head>
      <data><anon>R1C1</anon><anon>R1C2</anon><anon>R1C3</anon></data>
      <data><anon>R2C1</anon><anon>R2C2</anon><anon>R2C3</anon></data>
      <data><anon>R3C1</anon><anon>R3C2</anon><anon>R3C3</anon></data>
    </opt>

    {
      head => [ [ 'Col 1', 'Col 2', 'Col 3' ] ],
      data => [ [ 'R1C1', 'R1C2', 'R1C3' ],
                [ 'R2C1', 'R2C2', 'R2C3' ],
                [ 'R3C1', 'R3C2', 'R3C3' ]
              ]
    }

Anonymous arrays can be nested to arbirtrary levels and as a special case, if
the surrounding tags for an XML document contain only an anonymous array the
arrayref will be returned directly rather than the usual hashref:

    <opt>
      <anon><anon>Col 1</anon><anon>Col 2</anon></anon>
      <anon><anon>R1C1</anon><anon>R1C2</anon></anon>
      <anon><anon>R2C1</anon><anon>R2C2</anon></anon>
    </opt>

    [
      [ 'Col 1', 'Col 2' ],
      [ 'R1C1', 'R1C2' ],
      [ 'R2C1', 'R2C2' ]
    ]

Elements which only contain text content will simply be represented as a
scalar.  Where an element has both attributes and text content, the element
will be represented as a hashref with the text content in the 'content' key
(see the C<ContentKey> option):

  <opt>
    <one>first</one>
    <two attr="value">second</two>
  </opt>

  {
    one => 'first',
    two => { attr => 'value', content => 'second' }
  }

Mixed content (elements which contain both text content and nested elements)
will be not be represented in a useful way - element order and significant
whitespace will be lost.  If you need to work with mixed content, then
XML::Simple is not the right tool for your job - check out the next section.

=head1 SEE ALSO

L<XML::Compile> for processing XML when a schema is available

L<XML::Simple>, the SAX and original implementation

=head1 COPYRIGHTS

The interface design and large parts of the documentation were taken
from the L<XML::Simple> module, written by
Grant McLean E<lt>grantm@cpan.orgE<gt>

Copyrights of the perl code and the related documentation by
2008-2013 by [Mark Overmeer]. For other contributors see ChangeLog.

This program is free software; you can redistribute it and/or modify it
under the same terms as Perl itself.
See F<http://www.perl.com/perl/misc/Artistic.html>