XMLLINT(1)                      xmllint Manual                      XMLLINT(1)

       xmllint - command line XML tool

       xmllint [--version | --debug | --shell | --xpath "XPath_expression" |
               --debugent | --copy | --recover | --noent | --noout | --nonet |
               --path "PATH(S)" | --load-trace | --htmlout | --nowrap |
               --valid | --postvalid | --dtdvalid URL | --dtdvalidfpi FPI |
               --timing | --output FILE | --repeat | --insert | --compress |
               --html | --xmlout | --push | --memory | --maxmem NBBYTES |
               --nowarning | --noblanks | --nocdata | --format |
               --encode ENCODING | --dropdtd | --nsclean | --testIO |
               --catalogs | --nocatalogs | --auto | --xinclude |
               --noxincludenode | --loaddtd | --dtdattr | --stream | --walker
               | --pattern PATTERNVALUE | --chkregister | --relaxng SCHEMA |
               --schema SCHEMA | --c14n] {XML-FILE(S)... | -}

       xmllint --help

       The xmllint program parses one or more XML files, specified on the
       command line as XML-FILE (or the standard input if the filename
       provided is - ). It prints various types of output, depending upon the
       options selected. It is useful for detecting errors both in XML code
       and in the XML parser itself.

       xmllint is included in libxml(3).

       xmllint accepts the following options (in alphabetical order):

           Generate a small document for testing purposes.

           Use the SGML catalog(s) from SGML_CATALOG_FILES. Otherwise XML
           catalogs starting from /etc/xml/catalog are used by default.

           Turn on node registration. Useful for developers testing libxml(3)
           node tracking code.

           Turn on gzip(1) compression of output.

           Test the internal copy implementation.

           Use the W3C XML Canonicalisation (C14N) to serialize the result of
           parsing to stdout. It keeps comments in the result.

       --dtdvalid URL
           Use the DTD specified by an URL for validation.

       --dtdvalidfpi FPI
           Use the DTD specified by a Formal Public Identifier FPI for
           validation, note that this will require a catalog exporting that
           Formal Public Identifier to work.

           Parse a file and output an annotated tree of the in-memory version
           of the document.

           Debug the entities defined in the document.

           Remove DTD from output.

           Fetch external DTD and populate the tree with inherited attributes.

       --encode ENCODING
           Output in the given encoding. Note that this works for full
           document not fragments or result from XPath queries.

           Reformat and reindent the output. The XMLLINT_INDENT environment
           variable controls the indentation. The default value is two spaces
           " ").

           Print out a short usage summary for xmllint.

           Use the HTML parser.

           Output results as an HTML file. This causes xmllint to output the
           necessary HTML tags surrounding the result tree output so the
           results can be displayed/viewed in a browser.

           Test for valid insertions.

           Fetch an external DTD.

           Display all the documents loaded during the processing to stderr.

       --maxmem NNBYTES
           Test the parser memory support.  NNBYTES is the maximum number of
           bytes the library is allowed to allocate. This can also be used to
           make sure batch processing of XML files will not exhaust the
           virtual memory of the server running them.

           Parse from memory.

           Drop ignorable blank spaces.

           Do not use any catalogs.

           Substitute CDATA section by equivalent text nodes.

           Substitute entity values for entity references. By default, xmllint
           leaves entity references in place.

           Do not use the Internet to fetch DTDs or entities.

           Suppress output. By default, xmllint outputs the result tree.

           Do not emit warnings from the parser and/or validator.

           Do not output HTML doc wrapper.

           Do XInclude processing but do not generate XInclude start and end

           Remove redundant namespace declarations.

       --output FILE
           Define a file path where xmllint will save the result of parsing.
           Usually the programs build a tree and save it on stdout, with this
           option the result XML instance will be saved onto a file.

       --path "PATH(S)"
           Use the (space- or colon-separated) list of filesystem paths
           specified by PATHS to load DTDs or entities. Enclose
           space-separated lists by quotation marks.

       --pattern PATTERNVALUE
           Used to exercise the pattern recognition engine, which can be used
           with the reader interface to the parser. It allows to select some
           nodes in the document based on an XPath (subset) expression. Used
           for debugging.

           Validate after parsing has completed.

           Use the push mode of the parser.

           Output any parsable portions of an invalid document.

       --relaxng SCHEMA
           Use RelaxNG file named SCHEMA for validation.

           Repeat 100 times, for timing or profiling.

       --schema SCHEMA
           Use a W3C XML Schema file named SCHEMA for validation.

           Run a navigating shell. Details on available commands in shell mode
           are below (see the section called "SHELL COMMANDS").

       --xpath "XPath_expression"
           Run an XPath expression given as argument and print the result. In
           case of a nodeset result, each node in the node set is serialized
           in full in the output. In case of an empty node set the "XPath set
           is empty" result will be shown and an error exit code will be

           Use streaming API - useful when used in combination with --relaxng
           or --valid options for validation of files that are too large to be
           held in memory.

           Test user input/output support.

           Output information about the time it takes xmllint to perform the
           various steps.

           Determine if the document is a valid instance of the included
           Document Type Definition (DTD). A DTD to be validated against also
           can be specified at the command line using the --dtdvalid option.
           By default, xmllint also checks to determine if the document is

           Display the version of libxml(3) used.

           Test the walker module, which is a reader interface but for a
           document tree, instead of using the reader API on an unparsed
           document it works on an existing in-memory tree. Used for

           Do XInclude processing.

           Used in conjunction with --html. Usually when HTML is parsed the
           document is saved with the HTML serializer. But with this option
           the resulting document is saved with the XML serializer. This is
           primarily used to generate XHTML from HTML input.

       xmllint offers an interactive shell mode invoked with the --shell
       command. Available commands in shell mode include (in alphabetical

           Display XML base of the node.

           Leave the shell.

       cat NODE
           Display the given node or the current one.

       cd PATH
           Change the current node to the given path (if unique) or root if no
           argument is given.

       dir PATH
           Dumps information about the node (namespace, attributes, content).

       du PATH
           Show the structure of the subtree under the given path or the
           current node.

           Leave the shell.

           Show this help.

           Display memory usage.

       load FILENAME
           Load a new document with the given filename.

       ls PATH
           List contents of the given path or the current directory.

           Display the path to the current node.

           Leave the shell.

       save FILENAME
           Save the current document to the given filename or to the original

           Check the document for errors.

       write FILENAME
           Write the current node to the given filename.

           SGML catalog behavior can be changed by redirecting queries to the
           user's own set of catalogs. This can be done by setting the
           SGML_CATALOG_FILES environment variable to a list of catalogs. An
           empty one should deactivate loading the default /etc/sgml/catalog

           XML catalog behavior can be changed by redirecting queries to the
           user's own set of catalogs. This can be done by setting the
           XML_CATALOG_FILES environment variable to a space-separated list of
           catalogs. Use percent-encoding to escape spaces or other
           characters. An empty variable should deactivate loading the default
           /etc/xml/catalog catalog.

           Setting the environment variable XML_DEBUG_CATALOG to non-zero
           using the export command outputs debugging information related to
           catalog operations.

           Setting the environment variable XMLLINT_INDENT controls the
           indentation. The default value is two spaces " ".

       xmllint return codes provide information that can be used when calling
       it from scripts.

           No error


           Error in DTD

           Validation error

           Validation error

           Error in schema compilation

           Error writing output

           Error in pattern (generated when --pattern option is used)

           Error in Reader registration (generated when --chkregister option
           is used)

           Out of memory error

           XPath evaluation error


       More information can be found at

       o   libxml(3) web page https://gitlab.gnome.org/GNOME/libxml2

       John Fleck <jfleck@inkstain.net>

       Ziying Sherwin <sherwin@nlm.nih.gov>

       Heiko Rupp <hwr@pilhuhn.de>

       Copyright (C) 2001, 2004

libxml2                           02/19/2022                        XMLLINT(1)
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