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1<?xml version="1.0"?>
2<?xml-stylesheet type="text/xsl"
3   href="http://docbook.sourceforge.net/release/xsl/current/manpages/docbook.xsl"?>
4<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.1.2//EN"
5    "http://www.oasis-open.org/docbook/xml/4.1.2/docbookx.dtd" [
6
7    <!ENTITY xmllint "<command>xmllint</command>">
8]>
9
10<refentry>
11
12<refentryinfo>
13    <title>xmllint Manual</title>
14    <productname>libxml2</productname>
15    <copyright>
16        <year>2001</year>
17        <year>2004</year>
18    </copyright>
19    <authorgroup>
20        <author>
21            <firstname>John</firstname>
22            <surname>Fleck</surname>
23            <affiliation>
24                <address>
25                    <email>jfleck@inkstain.net</email>
26                </address>
27            </affiliation>
28        </author>
29        <author>
30            <firstname>Ziying</firstname>
31            <surname>Sherwin</surname>
32            <affiliation>
33                <address>
34                    <email>sherwin@nlm.nih.gov</email>
35                </address>
36            </affiliation>
37        </author>
38        <author>
39            <firstname>Heiko</firstname>
40            <surname>Rupp</surname>
41            <affiliation>
42                <address>
43                    <email>hwr@pilhuhn.de</email>
44                </address>
45            </affiliation>
46        </author>
47    </authorgroup>
48    <!-- still a bit buggy output, will talk to docbook-xsl upstream to fix this -->
49    <!-- <releaseinfo>This is release 0.5 of the xmllint Manual.</releaseinfo> -->
50    <!-- <edition>0.5</edition> -->
51</refentryinfo>
52
53<refmeta>
54    <refentrytitle>xmllint</refentrytitle>
55    <manvolnum>1</manvolnum>
56</refmeta>
57
58<refnamediv>
59    <refname>xmllint</refname>
60    <refpurpose>command line <acronym>XML</acronym> tool</refpurpose>
61</refnamediv>
62
63<refsynopsisdiv>
64    <cmdsynopsis>
65    <command>xmllint</command>
66        <group choice="opt">
67            <arg choice="plain"><option>--version</option></arg>
68            <arg choice="plain"><option>--debug</option></arg>
69            <arg choice="plain"><option>--quiet</option></arg>
70            <arg choice="plain"><option>--shell</option></arg>
71            <arg choice="plain"><option>--xpath "<replaceable class="option">XPath_expression</replaceable>"</option></arg>
72            <arg choice="plain"><option>--debugent</option></arg>
73            <arg choice="plain"><option>--copy</option></arg>
74            <arg choice="plain"><option>--recover</option></arg>
75            <arg choice="plain"><option>--huge</option></arg>
76            <arg choice="plain"><option>--nocompact</option></arg>
77            <arg choice="plain"><option>--nodefdtd</option></arg>
78            <arg choice="plain"><option>--nodict</option></arg>
79            <arg choice="plain"><option>--noenc</option></arg>
80            <arg choice="plain"><option>--noent</option></arg>
81            <arg choice="plain"><option>--nofixup-base-uris</option></arg>
82            <arg choice="plain"><option>--noout</option></arg>
83            <arg choice="plain"><option>--nonet</option></arg>
84            <arg choice="plain"><option>--path "<replaceable class="option">PATH(S)</replaceable>"</option></arg>
85            <arg choice="plain"><option>--load-trace</option></arg>
86            <arg choice="plain"><option>--htmlout</option></arg>
87            <arg choice="plain"><option>--nowrap</option></arg>
88            <arg choice="plain"><option>--valid</option></arg>
89            <arg choice="plain"><option>--postvalid</option></arg>
90            <arg choice="plain"><option>--dtdvalid <replaceable class="option">URL</replaceable></option></arg>
91            <arg choice="plain"><option>--dtdvalidfpi <replaceable class="option">FPI</replaceable></option></arg>
92            <arg choice="plain"><option>--timing</option></arg>
93            <arg choice="plain"><option>--output <replaceable class="option">FILE</replaceable></option></arg>
94            <arg choice="plain"><option>--repeat</option></arg>
95            <arg choice="plain"><option>--insert</option></arg>
96            <arg choice="plain"><option>--compress</option></arg>
97            <arg choice="plain"><option>--html</option></arg>
98            <arg choice="plain"><option>--xmlout</option></arg>
99            <arg choice="plain"><option>--push</option></arg>
100            <arg choice="plain"><option>--memory</option></arg>
101            <arg choice="plain"><option>--max-ampl <replaceable class="option">INTEGER</replaceable></option></arg>
102            <arg choice="plain"><option>--maxmem <replaceable class="option">NBBYTES</replaceable></option></arg>
103            <arg choice="plain"><option>--nowarning</option></arg>
104            <arg choice="plain"><option>--noblanks</option></arg>
105            <arg choice="plain"><option>--nocdata</option></arg>
106            <arg choice="plain"><option>--format</option></arg>
107            <arg choice="plain"><option>--pretty <replaceable class="option">INTEGER</replaceable></option></arg>
108            <arg choice="plain"><option>--encode <replaceable class="option">ENCODING</replaceable></option></arg>
109            <arg choice="plain"><option>--dropdtd</option></arg>
110            <arg choice="plain"><option>--nsclean</option></arg>
111            <arg choice="plain"><option>--testIO</option></arg>
112            <arg choice="plain"><option>--catalogs</option></arg>
113            <arg choice="plain"><option>--nocatalogs</option></arg>
114            <arg choice="plain"><option>--auto</option></arg>
115            <arg choice="plain"><option>--xinclude</option></arg>
116            <arg choice="plain"><option>--noxincludenode</option></arg>
117            <arg choice="plain"><option>--loaddtd</option></arg>
118            <arg choice="plain"><option>--dtdattr</option></arg>
119            <arg choice="plain"><option>--stream</option></arg>
120            <arg choice="plain"><option>--walker</option></arg>
121            <arg choice="plain"><option>--pattern <replaceable class="option">PATTERNVALUE</replaceable></option></arg>
122            <arg choice="plain"><option>--relaxng <replaceable class="option">SCHEMA</replaceable></option></arg>
123            <arg choice="plain"><option>--schema <replaceable class="option">SCHEMA</replaceable></option></arg>
124            <arg choice="plain"><option>--schematron <replaceable class="option">SCHEMA</replaceable></option></arg>
125            <arg choice="plain"><option>--c14n</option></arg>
126            <arg choice="plain"><option>--c14n11</option></arg>
127            <arg choice="plain"><option>--exc-c14n</option></arg>
128            <arg choice="plain"><option>--pedantic</option></arg>
129            <arg choice="plain"><option>--sax</option></arg>
130            <arg choice="plain"><option>--sax1</option></arg>
131            <arg choice="plain"><option>--oldxml10</option></arg>
132        </group>
133        <group choice="req">
134            <arg choice="plain" rep="repeat"><replaceable>XML-FILE(S)</replaceable></arg>
135            <arg choice="plain" rep="norepeat">-</arg>
136        </group>
137    </cmdsynopsis>
138</refsynopsisdiv>
139
140<refsect1 id="description">
141    <title>DESCRIPTION</title>
142    <para>
143        The &xmllint; program parses one or more <acronym>XML</acronym> files,
144        specified on the command line as <replaceable>XML-FILE</replaceable>
145        (or the standard input if the filename provided
146        is <emphasis role="bold">-</emphasis> ). It prints various types of
147        output, depending upon the options selected. It is useful for detecting
148        errors both in <acronym>XML</acronym> code and in
149        the <acronym>XML</acronym> parser itself.
150    </para>
151    <para>&xmllint; is included in <citerefentry>
152        <refentrytitle>libxml</refentrytitle>
153        <manvolnum>3</manvolnum>
154    </citerefentry>.</para>
155</refsect1>
156
157<refsect1 id="options">
158    <title>OPTIONS</title>
159    <para>
160        &xmllint; accepts the following options (in alphabetical order):
161    </para>
162
163    <variablelist>
164
165        <varlistentry>
166            <term><option>--auto</option></term>
167            <listitem>
168                <para>Generate a small document for testing purposes.</para>
169            </listitem>
170        </varlistentry>
171
172        <varlistentry>
173            <term><option>--catalogs</option></term>
174            <listitem>
175                <para>
176                    Use the <acronym>SGML</acronym> catalog(s) from <envar>SGML_CATALOG_FILES</envar>.
177                    Otherwise <acronym>XML</acronym> catalogs starting
178                    from <filename>/etc/xml/catalog</filename> or, more specifically,
179                    <filename>${sysconfdir}/xml/catalog</filename> are used by default.
180                </para>
181            </listitem>
182        </varlistentry>
183
184        <varlistentry>
185            <term><option>--compress</option></term>
186            <listitem>
187                <para>
188                    Turn on <citerefentry>
189                <refentrytitle>gzip</refentrytitle>
190                <manvolnum>1</manvolnum>
191            </citerefentry> compression of output.
192                </para>
193            </listitem>
194        </varlistentry>
195
196        <varlistentry>
197            <term><option>--copy</option></term>
198            <listitem>
199                <para>Test the internal copy implementation.</para>
200            </listitem>
201        </varlistentry>
202
203        <varlistentry>
204            <term><option>--c14n</option></term>
205            <term><option>--c14n11</option></term>
206            <term><option>--exc-c14n</option></term>
207            <listitem>
208                <para>
209                    Use the W3C <acronym>XML</acronym> Canonicalisation (<acronym>C14N</acronym>) to
210                    serialize the result of parsing to <filename class="devicefile">stdout</filename>.
211                    It keeps comments in the result.
212                </para>
213            </listitem>
214        </varlistentry>
215
216        <varlistentry>
217            <term><option>--dtdvalid <replaceable class="option">URL</replaceable></option></term>
218            <listitem>
219                <para>
220                    Use the <acronym>DTD</acronym> specified by
221                    an <replaceable>URL</replaceable> for validation.
222                </para>
223            </listitem>
224        </varlistentry>
225
226        <varlistentry>
227            <term><option>--dtdvalidfpi <replaceable class="option">FPI</replaceable></option></term>
228            <listitem>
229                <para>
230                    Use the <acronym>DTD</acronym> specified by a Formal Public
231                    Identifier <replaceable>FPI</replaceable> for validation, note that this
232                    will require a catalog exporting that Formal Public Identifier to work.
233                </para>
234            </listitem>
235        </varlistentry>
236
237        <varlistentry>
238            <term><option>--debug</option></term>
239            <listitem>
240                <para>
241                    Parse a file and output an annotated tree of the
242                    in-memory version of the document.
243                </para>
244            </listitem>
245        </varlistentry>
246
247        <varlistentry>
248            <term><option>--debugent</option></term>
249            <listitem>
250                <para>Debug the entities defined in the document.</para>
251            </listitem>
252        </varlistentry>
253
254        <varlistentry>
255            <term><option>--dropdtd</option></term>
256            <listitem>
257                <para>Remove <acronym>DTD</acronym> from output.</para>
258            </listitem>
259        </varlistentry>
260
261        <varlistentry>
262            <term><option>--dtdattr</option></term>
263            <listitem>
264                <para>
265                    Fetch external <acronym>DTD</acronym> and populate the tree with
266                    inherited attributes.
267                </para>
268            </listitem>
269        </varlistentry>
270
271        <varlistentry>
272            <term><option>--encode <replaceable class="option">ENCODING</replaceable></option></term>
273            <listitem>
274                <para>Output in the given encoding. Note that this works for full document not fragments or result from XPath queries.</para>
275            </listitem>
276        </varlistentry>
277
278        <varlistentry>
279            <term><option>--format</option></term>
280            <listitem>
281                <para>
282                    Reformat and reindent the output. The <envar>XMLLINT_INDENT</envar>
283                    environment variable controls the indentation. The default value is two
284                    spaces &quot;  &quot;).
285                </para>
286                <para>
287                    Especially in the absence of a DTD, this feature has never worked reliably
288                    and is fundamentally broken.
289                </para>
290            </listitem>
291        </varlistentry>
292
293        <varlistentry>
294            <term><option>--html</option></term>
295            <listitem>
296                <para>Use the <acronym>HTML</acronym> parser.</para>
297            </listitem>
298        </varlistentry>
299
300        <varlistentry>
301            <term><option>--htmlout</option></term>
302            <listitem>
303                <para>
304                    Output results as an <acronym>HTML</acronym> file. This
305                    causes &xmllint; to output the necessary <acronym>HTML</acronym>
306                    tags surrounding the result tree output so the results can be
307                    displayed/viewed in a browser.
308                </para>
309            </listitem>
310        </varlistentry>
311
312        <varlistentry>
313            <term><option>--huge</option></term>
314            <listitem>
315                <para>Ignore some hardcoded parser limits.</para>
316            </listitem>
317        </varlistentry>
318
319        <varlistentry>
320            <term><option>--insert</option></term>
321            <listitem>
322                <para>Test for valid insertions.</para>
323            </listitem>
324        </varlistentry>
325
326        <varlistentry>
327            <term><option>--loaddtd</option></term>
328            <listitem>
329                <para>Fetch an external <acronym>DTD</acronym>.</para>
330            </listitem>
331        </varlistentry>
332
333        <varlistentry>
334            <term><option>--load-trace</option></term>
335            <listitem>
336                <para>
337                    Display all the documents loaded during the processing
338                    to <filename class="devicefile">stderr</filename>.
339                </para>
340            </listitem>
341        </varlistentry>
342
343        <varlistentry>
344            <term><option>--max-ampl <replaceable class="option">INTEGER</replaceable></option></term>
345            <listitem>
346                <para>
347                    Set the maximum amplification factor which protects against
348                    exponential entity expansion ("billion laughs"). The default value
349                    is 5. Documents making heavy use of entity expansion may require a
350                    higher value.
351                </para>
352            </listitem>
353        </varlistentry>
354
355        <varlistentry>
356            <term><option>--maxmem <replaceable class="option">NNBYTES</replaceable></option></term>
357            <listitem>
358                <para>
359                    Test the parser memory support. <replaceable>NNBYTES</replaceable>
360                    is the maximum number of bytes the library is allowed to allocate.
361                    This can also be used to make sure batch processing
362                    of <acronym>XML</acronym> files will not exhaust the virtual memory
363                    of the server running them.
364                </para>
365            </listitem>
366        </varlistentry>
367
368        <varlistentry>
369            <term><option>--memory</option></term>
370            <listitem>
371                <para>Parse from memory.</para>
372            </listitem>
373        </varlistentry>
374
375        <varlistentry>
376            <term><option>--noblanks</option></term>
377            <listitem>
378                <para>Drop ignorable blank spaces.</para>
379            </listitem>
380        </varlistentry>
381
382        <varlistentry>
383            <term><option>--nocatalogs</option></term>
384            <listitem>
385                <para>Do not use any catalogs.</para>
386            </listitem>
387        </varlistentry>
388
389        <varlistentry>
390            <term><option>--nocdata</option></term>
391            <listitem>
392                <para>Substitute CDATA section by equivalent text nodes.</para>
393            </listitem>
394        </varlistentry>
395
396        <varlistentry>
397            <term><option>--nocompact</option></term>
398            <listitem>
399                <para>
400                    Do not generate compact text nodes (parser option
401                    XML_PARSE_COMPACT). Only for debugging.
402                </para>
403            </listitem>
404        </varlistentry>
405
406        <varlistentry>
407            <term><option>--nodefdtd</option></term>
408            <listitem>
409                <para>
410                    Do not set default HTML doctype (parser option
411                    HTML_PARSE_NODEFDTD).
412                </para>
413            </listitem>
414        </varlistentry>
415
416        <varlistentry>
417            <term><option>--nodict</option></term>
418            <listitem>
419                <para>
420                    Don't use dictionaries (parser option XML_PARSE_NODICT).
421                    Only for debugging.
422                </para>
423            </listitem>
424        </varlistentry>
425
426        <varlistentry>
427            <term><option>--noenc</option></term>
428            <listitem>
429                <para>
430                    Ignore encoding declaration (parser option
431                    XML_PARSE_IGNORE_ENC).
432                </para>
433            </listitem>
434        </varlistentry>
435
436        <varlistentry>
437            <term><option>--noent</option></term>
438            <listitem>
439                <para>
440                    Substitute entity values for entity references. By default, &xmllint;
441                    leaves entity references in place.
442                </para>
443            </listitem>
444        </varlistentry>
445
446        <varlistentry>
447            <term><option>--nofixup-base-uris</option></term>
448            <listitem>
449                <para>
450                    Don't fix xml:base URIs when processing XIncludes
451                    (parser option XML_PARSE_NOBASEFIX).
452                </para>
453            </listitem>
454        </varlistentry>
455
456        <varlistentry>
457            <term><option>--nonet</option></term>
458            <listitem>
459                <para>
460                    Do not use the Internet to fetch <acronym>DTD</acronym>s or entities.
461                </para>
462            </listitem>
463        </varlistentry>
464
465        <varlistentry>
466            <term><option>--noout</option></term>
467            <listitem>
468                <para>
469                    Suppress output. By default, &xmllint; outputs the result tree.
470                </para>
471            </listitem>
472        </varlistentry>
473
474        <varlistentry>
475            <term><option>--nowarning</option></term>
476            <listitem>
477                <para>Do not emit warnings from the parser and/or validator.</para>
478            </listitem>
479        </varlistentry>
480
481        <varlistentry>
482            <term><option>--nowrap</option></term>
483            <listitem>
484                <para>Do not output <acronym>HTML</acronym> doc wrapper.</para>
485            </listitem>
486        </varlistentry>
487
488        <varlistentry>
489            <term><option>--noxincludenode</option></term>
490            <listitem>
491                <para>
492                    Do XInclude processing but do not generate XInclude start and end nodes.
493                </para>
494            </listitem>
495        </varlistentry>
496
497        <varlistentry>
498            <term><option>--nsclean</option></term>
499            <listitem>
500                <para>Remove redundant namespace declarations.</para>
501            </listitem>
502        </varlistentry>
503
504        <varlistentry>
505            <term><option>--oldxml10</option></term>
506            <listitem>
507                <para>
508                    Use deprecated parsing rules before XML 1.0,
509                    5th edition.
510                </para>
511            </listitem>
512        </varlistentry>
513
514        <varlistentry>
515            <term><option>--output <replaceable class="option">FILE</replaceable></option></term>
516            <listitem>
517                <para>
518                    Define a file path where &xmllint; will save the result of parsing.
519                    Usually the programs build a tree and save it
520                    on <filename class="devicefile">stdout</filename>, with this option
521                    the result <acronym>XML</acronym> instance will be saved onto a file.
522                </para>
523            </listitem>
524        </varlistentry>
525
526        <varlistentry>
527            <term><option>--path "<replaceable class="option">PATH(S)</replaceable>"</option></term>
528            <listitem>
529                <para>
530                    Use the (space- or colon-separated) list of filesystem paths specified
531                    by <replaceable>PATHS</replaceable> to load <acronym>DTD</acronym>s or
532                    entities. Enclose space-separated lists by quotation marks.
533                </para>
534            </listitem>
535        </varlistentry>
536
537        <varlistentry>
538            <term><option>--pattern <replaceable class="option">PATTERNVALUE</replaceable></option></term>
539            <listitem>
540                <para>
541                    Used to exercise the pattern recognition engine, which can be used
542                    with the reader interface to the parser. It allows to select some
543                    nodes in the document based on an XPath (subset) expression. Used
544                    for debugging.
545                </para>
546            </listitem>
547        </varlistentry>
548
549        <varlistentry>
550            <term><option>--pedantic</option></term>
551            <listitem>
552                <para>Enable additional warnings.</para>
553            </listitem>
554        </varlistentry>
555
556        <varlistentry>
557            <term><option>--postvalid</option></term>
558            <listitem>
559                <para>Validate after parsing has completed.</para>
560            </listitem>
561        </varlistentry>
562
563        <varlistentry>
564            <term><option>--pretty <replaceable class="option">INTEGER</replaceable></option></term>
565            <listitem>
566                <para>
567                    Value 0 means no formatting, 1 means XML_SAVE_FORMAT
568                    (same as --format), 2 means XML_SAVE_WSNONSIG.
569                </para>
570            </listitem>
571        </varlistentry>
572
573        <varlistentry>
574            <term><option>--push</option></term>
575            <listitem>
576                <para>Use the push mode of the parser.</para>
577            </listitem>
578        </varlistentry>
579
580        <varlistentry>
581            <term><option>--quiet</option></term>
582            <listitem>
583                <para>Don't print informational messages to stderr.</para>
584            </listitem>
585        </varlistentry>
586
587        <varlistentry>
588            <term><option>--recover</option></term>
589            <listitem>
590                <para>Output any parsable portions of an invalid document.</para>
591            </listitem>
592        </varlistentry>
593
594        <varlistentry>
595            <term><option>--relaxng <replaceable class="option">SCHEMA</replaceable></option></term>
596            <listitem>
597                <para>
598                    Use RelaxNG file named <replaceable class="option">SCHEMA</replaceable>
599                    for validation.
600                </para>
601            </listitem>
602        </varlistentry>
603
604        <varlistentry>
605            <term><option>--repeat</option></term>
606            <listitem>
607                <para>Repeat 100 times, for timing or profiling.</para>
608            </listitem>
609        </varlistentry>
610
611        <varlistentry>
612            <term><option>--sax</option></term>
613            <listitem>
614                <para>Print SAX callbacks (only for debugging).</para>
615            </listitem>
616        </varlistentry>
617
618        <varlistentry>
619            <term><option>--sax1</option></term>
620            <listitem>
621                <para>Use deprecated SAX1 interface (only for debugging).</para>
622            </listitem>
623        </varlistentry>
624
625        <varlistentry>
626            <term><option>--schema <replaceable>SCHEMA</replaceable></option></term>
627            <listitem>
628                <para>
629                    Use a W3C <acronym>XML</acronym> Schema file
630                    named <replaceable>SCHEMA</replaceable> for validation.
631                </para>
632            </listitem>
633        </varlistentry>
634
635        <varlistentry>
636            <term><option>--schematron <replaceable>SCHEMA</replaceable></option></term>
637            <listitem>
638                <para>
639                    Use a Schematron file
640                    named <replaceable>SCHEMA</replaceable> for validation.
641                </para>
642            </listitem>
643        </varlistentry>
644
645        <varlistentry>
646            <term><option>--shell</option></term>
647            <listitem>
648                <para>
649                    Run a navigating shell. Details on available commands in shell mode
650                    are below (see <xref linkend="shell"/>).
651                </para>
652            </listitem>
653        </varlistentry>
654
655        <varlistentry>
656            <term><option>--xpath "<replaceable class="option">XPath_expression</replaceable>"</option></term>
657            <listitem>
658                <para>
659                    Run an XPath expression given as argument and print the
660                    result. In case of a nodeset result, each node in the
661                    node set is serialized in full in the output. In case
662                    of an empty node set the "XPath set is empty" result
663                    will be shown and exit code 11 will be returned..
664                    This feature is EXPERIMENTAL. Implementation details can
665                    change without futher notice.
666                </para>
667            </listitem>
668        </varlistentry>
669
670        <varlistentry>
671            <term><option>--stream</option></term>
672            <listitem>
673                <para>
674                    Use streaming <acronym>API</acronym> - useful when used in combination
675                    with <option>--relaxng</option> or <option>--valid</option> options
676                    for validation of files that are too large to be held in memory.
677                </para>
678            </listitem>
679        </varlistentry>
680
681        <varlistentry>
682            <term><option>--testIO</option></term>
683            <listitem>
684                <para>Test user input/output support.</para>
685            </listitem>
686        </varlistentry>
687
688        <varlistentry>
689            <term><option>--timing</option></term>
690            <listitem>
691                <para>
692                    Output information about the time it takes &xmllint; to perform the
693                    various steps.
694                </para>
695            </listitem>
696        </varlistentry>
697
698        <varlistentry>
699            <term><option>--valid</option></term>
700            <listitem>
701                <para>
702                    Determine if the document is a valid instance of the included
703                    Document Type Definition (<acronym>DTD</acronym>).
704                    A <acronym>DTD</acronym> to be validated against also can be
705                    specified at the command line using the <option>--dtdvalid</option>
706                    option. By default, &xmllint; also checks to determine if the
707                    document is well-formed.
708                </para>
709            </listitem>
710        </varlistentry>
711
712        <varlistentry>
713            <term><option>--version</option></term>
714            <listitem>
715                <para>
716                    Display the version of <citerefentry>
717                <refentrytitle>libxml</refentrytitle>
718                <manvolnum>3</manvolnum>
719            </citerefentry> used.
720                </para>
721            </listitem>
722        </varlistentry>
723
724        <varlistentry>
725            <term><option>--walker</option></term>
726            <listitem>
727                <para>
728                    Test the walker module, which is a reader interface but for a
729                    document tree, instead of using the reader <acronym>API</acronym> on
730                    an unparsed document it works on an existing in-memory tree. Used for
731                    debugging.
732                </para>
733            </listitem>
734        </varlistentry>
735
736        <varlistentry>
737            <term><option>--xinclude</option></term>
738            <listitem>
739                <para>Do XInclude processing.</para>
740            </listitem>
741        </varlistentry>
742
743        <varlistentry>
744            <term><option>--xmlout</option></term>
745            <listitem>
746                <para>
747                    Used in conjunction with <option>--html</option>. Usually
748                    when <acronym>HTML</acronym> is parsed the document is saved with
749                    the <acronym>HTML</acronym> serializer. But with this option the
750                    resulting document is saved with the <acronym>XML</acronym>
751                    serializer. This is primarily used to
752                    generate <acronym>XHTML</acronym> from <acronym>HTML</acronym> input.
753                </para>
754            </listitem>
755        </varlistentry>
756
757    </variablelist>
758</refsect1>
759
760<refsect1 id="shell">
761    <title>SHELL COMMANDS</title>
762    <para>
763        &xmllint; offers an interactive shell mode invoked with
764        the <option>--shell</option> command. Available commands in shell mode
765        include (in alphabetical order):
766    </para>
767    <variablelist>
768
769        <varlistentry>
770            <term><command>base</command></term>
771            <listitem>
772                <para>Display <acronym>XML</acronym> base of the node.</para>
773            </listitem>
774        </varlistentry>
775
776        <varlistentry>
777            <term><command>bye</command></term>
778            <listitem>
779                <para>Leave the shell.</para>
780            </listitem>
781        </varlistentry>
782
783        <varlistentry>
784            <term><command>cat <replaceable>NODE</replaceable></command></term>
785            <listitem>
786                <para>Display the given node or the current one.</para>
787            </listitem>
788        </varlistentry>
789
790        <varlistentry>
791            <term><command>cd <replaceable>PATH</replaceable></command></term>
792            <listitem>
793                <para>
794                    Change the current node to the given path (if unique) or root if no
795                    argument is given.
796                </para>
797            </listitem>
798        </varlistentry>
799
800        <varlistentry>
801            <term><command>dir <replaceable>PATH</replaceable></command></term>
802            <listitem>
803                <para>
804                    Dumps information about the node (namespace, attributes, content).
805                </para>
806            </listitem>
807        </varlistentry>
808
809        <varlistentry>
810            <term><command>du <replaceable>PATH</replaceable></command></term>
811            <listitem>
812                <para>
813                    Show the structure of the subtree under the given path or the current node.
814                </para>
815            </listitem>
816        </varlistentry>
817
818        <varlistentry>
819            <term><command>exit</command></term>
820            <listitem>
821                <para>Leave the shell.</para>
822            </listitem>
823        </varlistentry>
824
825        <varlistentry>
826            <term><command>help</command></term>
827            <listitem>
828                <para>Show this help.</para>
829            </listitem>
830        </varlistentry>
831
832        <varlistentry>
833            <term><command>load <replaceable>FILENAME</replaceable></command></term>
834            <listitem>
835                <para>Load a new document with the given filename.</para>
836            </listitem>
837        </varlistentry>
838
839        <varlistentry>
840            <term><command>ls <replaceable>PATH</replaceable></command></term>
841            <listitem>
842                <para>List contents of the given path or the current directory.</para>
843            </listitem>
844        </varlistentry>
845
846        <varlistentry>
847            <term><command>pwd</command></term>
848            <listitem>
849                <para>Display the path to the current node.</para>
850            </listitem>
851        </varlistentry>
852
853        <varlistentry>
854            <term><command>quit</command></term>
855            <listitem>
856                <para>Leave the shell.</para>
857            </listitem>
858        </varlistentry>
859
860        <varlistentry>
861            <term><command>save <replaceable>FILENAME</replaceable></command></term>
862            <listitem>
863                <para>
864                    Save the current document to the given filename or to the original name.
865                </para>
866            </listitem>
867        </varlistentry>
868
869        <varlistentry>
870            <term><option>validate</option></term>
871            <listitem>
872                <para>Check the document for errors.</para>
873            </listitem>
874        </varlistentry>
875
876        <varlistentry>
877            <term><command>write <replaceable>FILENAME</replaceable></command></term>
878            <listitem>
879                <para>Write the current node to the given filename.</para>
880            </listitem>
881        </varlistentry>
882
883    </variablelist>
884</refsect1>
885
886<refsect1 id="environment">
887    <title>ENVIRONMENT</title>
888    <variablelist>
889
890        <varlistentry>
891            <term><envar>SGML_CATALOG_FILES</envar></term>
892            <listitem>
893                <para><acronym>SGML</acronym> catalog behavior can be changed by redirecting
894                    queries to the user's own set of catalogs. This can be done by setting
895                    the <envar>SGML_CATALOG_FILES</envar> environment variable to a list
896                    of catalogs. An empty one should deactivate loading the
897                    default catalog.
898                </para>
899            </listitem>
900        </varlistentry>
901
902        <varlistentry>
903            <term><envar>XML_CATALOG_FILES</envar></term>
904            <listitem>
905                <para><acronym>XML</acronym> catalog behavior can be changed by redirecting
906                    queries to the user's own set of catalogs. This can be done by setting
907                    the <envar>XML_CATALOG_FILES</envar> environment variable to a space-separated
908                    list of catalogs. Use percent-encoding to escape spaces or other characters.
909                    An empty variable should deactivate loading the default catalog.
910                </para>
911            </listitem>
912        </varlistentry>
913
914        <varlistentry>
915            <term><envar>XML_DEBUG_CATALOG</envar></term>
916            <listitem>
917                <para>Setting the environment variable <envar>XML_DEBUG_CATALOG</envar>
918                    to <parameter>non-zero</parameter> using the <command>export</command>
919                    command outputs debugging information related to catalog operations.
920                </para>
921            </listitem>
922        </varlistentry>
923
924        <varlistentry>
925            <term><envar>XMLLINT_INDENT</envar></term>
926            <listitem>
927                <para>Setting the environment variable <envar>XMLLINT_INDENT</envar>
928                    controls the indentation. The default value is two spaces &quot;  &quot;.
929                </para>
930            </listitem>
931        </varlistentry>
932
933    </variablelist>
934</refsect1>
935
936<refsect1 id="diagnostics">
937    <title>DIAGNOSTICS</title>
938    <para>
939        &xmllint; return codes provide information that can be used when
940        calling it from scripts.
941    </para>
942    <!-- better use segmentedlist element later,
943         which is currently only supported in snapshots -->
944    <variablelist>
945
946        <varlistentry>
947            <term><errorcode>0</errorcode></term>
948            <listitem>
949                <para>No error</para>
950            </listitem>
951        </varlistentry>
952
953        <varlistentry>
954            <term><errorcode>1</errorcode></term>
955            <listitem>
956                <para>Unclassified</para>
957            </listitem>
958        </varlistentry>
959
960        <varlistentry>
961            <term><errorcode>2</errorcode></term>
962            <listitem>
963                <para>Error in <acronym>DTD</acronym></para>
964            </listitem>
965        </varlistentry>
966
967        <varlistentry>
968            <term><errorcode>3</errorcode></term>
969            <listitem>
970                <para>Validation error</para>
971            </listitem>
972        </varlistentry>
973
974        <varlistentry>
975            <term><errorcode>4</errorcode></term>
976            <listitem>
977                <para>Validation error</para>
978            </listitem>
979        </varlistentry>
980
981        <varlistentry>
982            <term><errorcode>5</errorcode></term>
983            <listitem>
984                <para>Error in schema compilation</para>
985            </listitem>
986        </varlistentry>
987
988        <varlistentry>
989            <term><errorcode>6</errorcode></term>
990            <listitem>
991                <para>Error writing output</para>
992            </listitem>
993        </varlistentry>
994
995        <varlistentry>
996            <term><errorcode>7</errorcode></term>
997            <listitem>
998                <para>
999                    Error in pattern (generated when <option>--pattern</option> option is used)
1000                </para>
1001            </listitem>
1002        </varlistentry>
1003
1004        <varlistentry>
1005            <term><errorcode>9</errorcode></term>
1006            <listitem>
1007                <para>Out of memory error</para>
1008            </listitem>
1009        </varlistentry>
1010
1011        <varlistentry>
1012            <term><errorcode>10</errorcode></term>
1013            <listitem>
1014                <para>XPath evaluation error</para>
1015            </listitem>
1016        </varlistentry>
1017
1018        <varlistentry>
1019            <term><errorcode>11</errorcode></term>
1020            <listitem>
1021                <para>XPath result is empty</para>
1022            </listitem>
1023        </varlistentry>
1024
1025    </variablelist>
1026</refsect1>
1027
1028<refsect1 id="seealso">
1029    <title>SEE ALSO</title>
1030    <para><citerefentry>
1031            <refentrytitle>libxml</refentrytitle>
1032            <manvolnum>3</manvolnum>
1033        </citerefentry>
1034    </para>
1035    <para>
1036        More information can be found at
1037        <itemizedlist>
1038            <listitem>
1039                <para><citerefentry>
1040                        <refentrytitle>libxml</refentrytitle>
1041                        <manvolnum>3</manvolnum>
1042                    </citerefentry> web page <ulink url="https://gitlab.gnome.org/GNOME/libxml2"/>
1043                </para>
1044            </listitem>
1045        </itemizedlist>
1046    </para>
1047</refsect1>
1048
1049</refentry>
1050