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 list of catalogs. An
       empty one should deactivate loading the default /etc/xml/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



   More information can be found at

   *   libxml(3) web page http://www.xmlsoft.org/

   *   W3C XSLT page http://www.w3.org/TR/xslt


   John Fleck <jfleck@inkstain.net>

   Ziying Sherwin <sherwin@nlm.nih.gov>

   Heiko Rupp <hwr@pilhuhn.de>


   Copyright  2001, 2004

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