Provided by: libxml2-utils_2.7.8.dfsg-5.1ubuntu4_amd64 bug


       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

              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

              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 debugging.

              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

       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