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XMLLINT(1)                                                          XMLLINT(1)

       xmllint - command line XML tool

       xmllint [--version --debug --shell --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):

       --auto 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.

       --copy Test the internal copy implementation.

       --c14n 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.

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

       --help Print out a short usage summary for xmllint.

       --html 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 nodes.

              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

              Validate after parsing has completed.

       --push 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").

              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 well-formed.

              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 debugging.

              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 order):

       base   Display XML base of the node.

       bye    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.

       exit   Leave the shell.

       help   Show this help.

       free   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.

       pwd    Display the path to the current node.

       quit   Leave the shell.

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

              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 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 list of catalogs. An empty one 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.

       0      No error

       1      Unclassified

       2      Error in DTD

       3      Validation error

       4      Validation error

       5      Error in schema compilation

       6      Error writing output

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

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

       9      Out of memory error


       More information can be found at

       ?  libxml(3) web page

       ?  W3C XSLT page

       John Fleck <>, Ziying Sherwin <>, Heiko Rupp <>.

libxml2                             $Date$                          XMLLINT(1)