xmllint

To apply file formatting you must set XML_XMLLINT_CLI_LINT_MODE: file and XML_XMLLINT_AUTOFORMAT: true.

xmllint documentation

Version in MegaLinter: 21207
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See How to configure xmllint rules

Configuration in MegaLinter

Enable xmllint by adding XML_XMLLINT in ENABLE_LINTERS variable
Disable xmllint by adding XML_XMLLINT in DISABLE_LINTERS variable

Enable autofixes by adding XML_XMLLINT in APPLY_FIXES variable

Variable	Description	Default value
XML_XMLLINT_AUTOFORMAT	If set to `true`, it will reformat and reindent the output	`false`
XML_XMLLINT_INDENT	The number of indentation spaces when `XML_XMLLINT_AUTOFORMAT` is `true`	``
XML_XMLLINT_ARGUMENTS	User custom arguments to add in linter CLI call Ex: `-s --foo "bar"`
XML_XMLLINT_COMMAND_REMOVE_ARGUMENTS	User custom arguments to remove from command line before calling the linter Ex: `-s --foo "bar"`
XML_XMLLINT_FILTER_REGEX_INCLUDE	Custom regex including filter Ex: `(src\\|lib)`	Include every file
XML_XMLLINT_FILTER_REGEX_EXCLUDE	Custom regex excluding filter Ex: `(test\\|examples)`	Exclude no file
XML_XMLLINT_CLI_LINT_MODE	Override default CLI lint mode - `file`: Calls the linter for each file - `list_of_files`: Call the linter with the list of files as argument - `project`: Call the linter from the root of the project	`list_of_files`
XML_XMLLINT_FILE_EXTENSIONS	Allowed file extensions. `"*"` matches any extension, `""` matches empty extension. Empty list excludes all files Ex: `[".py", ""]`	`[".xml", ".xsd"]`
XML_XMLLINT_FILE_NAMES_REGEX	File name regex filters. Regular expression list for filtering files by their base names using regex full match. Empty list includes all files Ex: `["Dockerfile(-.+)?", "Jenkinsfile"]`	Include every file
XML_XMLLINT_PRE_COMMANDS	List of bash commands to run before the linter	None
XML_XMLLINT_POST_COMMANDS	List of bash commands to run after the linter	None
XML_XMLLINT_UNSECURED_ENV_VARIABLES	List of env variables explicitly not filtered before calling XML_XMLLINT and its pre/post commands	None
XML_XMLLINT_DISABLE_ERRORS	Run linter but consider errors as warnings	`false`
XML_XMLLINT_DISABLE_ERRORS_IF_LESS_THAN	Maximum number of errors allowed	`0`
XML_XMLLINT_CLI_EXECUTABLE	Override CLI executable	`['xmllint']`

MegaLinter Flavors

This linter is available in the following flavors

Flavor	Description	Embedded linters
all	Default MegaLinter Flavor	124
c_cpp	Optimized for pure C/C++ projects	54
ci_light	Optimized for CI items (Dockerfile, Jenkinsfile, JSON/YAML schemas,XML	21
cupcake	MegaLinter for the most commonly used languages	83
documentation	MegaLinter for documentation projects	49
dotnet	Optimized for C, C++, C# or VB based projects	62
dotnetweb	Optimized for C, C++, C# or VB based projects with JS/TS	71
go	Optimized for GO based projects	51
java	Optimized for JAVA based projects	52
javascript	Optimized for JAVASCRIPT or TYPESCRIPT based projects	59
php	Optimized for PHP based projects	54
python	Optimized for PYTHON based projects	62
ruby	Optimized for RUBY based projects	50
rust	Optimized for RUST based projects	50
salesforce	Optimized for Salesforce based projects	54
swift	Optimized for SWIFT based projects	50
terraform	Optimized for TERRAFORM based projects	54

Behind the scenes

How are identified applicable files

File extensions: .xml, .xsd

How the linting is performed

xmllint is called once with the list of files as arguments (list_of_files CLI lint mode)

Example calls

xmllint myXMLfile.xml

xmllint myXSDfile.xsd

xmllint --format myXMLfile.xml --output myXMLfile.xml

Help content

Unknown option --help
Usage : xmllint [options] XMLfiles ...
  Parse the XML files and output the result of the parsing
  --version : display the version of the XML library used
  --debug : dump a debug tree of the in-memory document
  --shell : run a navigating shell
  --debugent : debug the entities defined in the document
  --copy : used to test the internal copy implementation
  --recover : output what was parsable on broken XML documents
  --huge : remove any internal arbitrary parser limits
  --noent : substitute entity references by their value
  --noenc : ignore any encoding specified inside the document
  --noout : don't output the result tree
  --path 'paths': provide a set of paths for resources
  --load-trace : print trace of all external entities loaded
  --nonet : refuse to fetch DTDs or entities over network
  --nocompact : do not generate compact text nodes
  --htmlout : output results as HTML
  --nowrap : do not put HTML doc wrapper
  --valid : validate the document in addition to std well-formed check
  --postvalid : do a posteriori validation, i.e after parsing
  --dtdvalid URL : do a posteriori validation against a given DTD
  --dtdvalidfpi FPI : same but name the DTD with a Public Identifier
  --quiet : be quiet when succeeded
  --timing : print some timings
  --output file or -o file: save to a given file
  --repeat : repeat 100 times, for timing or profiling
  --insert : ad-hoc test for valid insertions
  --compress : turn on gzip compression of output
  --html : use the HTML parser
  --xmlout : force to use the XML serializer when using --html
  --nodefdtd : do not default HTML doctype
  --push : use the push mode of the parser
  --pushsmall : use the push mode of the parser using tiny increments
  --memory : parse from memory
  --maxmem nbbytes : limits memory allocation to nbbytes bytes
  --nowarning : do not emit warnings from parser/validator
  --noblanks : drop (ignorable?) blanks spaces
  --nocdata : replace cdata section with text nodes
  --format : reformat/reindent the output
  --encode encoding : output in the given encoding
  --dropdtd : remove the DOCTYPE of the input docs
  --pretty STYLE : pretty-print in a particular style
                   0 Do not pretty print
                   1 Format the XML content, as --format
                   2 Add whitespace inside tags, preserving content
  --c14n : save in W3C canonical format v1.0 (with comments)
  --c14n11 : save in W3C canonical format v1.1 (with comments)
  --exc-c14n : save in W3C exclusive canonical format (with comments)
  --nsclean : remove redundant namespace declarations
  --testIO : test user I/O support
  --catalogs : use SGML catalogs from $SGML_CATALOG_FILES
               otherwise XML Catalogs starting from
           file:///etc/xml/catalog are activated by default
  --nocatalogs: deactivate all catalogs
  --auto : generate a small doc on the fly
  --xinclude : do XInclude processing
  --noxincludenode : same but do not generate XInclude nodes
  --nofixup-base-uris : do not fixup xml:base uris
  --loaddtd : fetch external DTD
  --dtdattr : loaddtd + populate the tree with inherited attributes
  --stream : use the streaming interface to process very large files
  --walker : create a reader and walk though the resulting doc
  --pattern pattern_value : test the pattern support
  --chkregister : verify the node registration code
  --relaxng schema : do RelaxNG validation against the schema
  --schema schema : do validation against the WXS schema
  --schematron schema : do validation against a schematron
  --sax1: use the old SAX1 interfaces for processing
  --sax: do not build a tree but work just at the SAX level
  --oldxml10: use XML-1.0 parsing rules before the 5th edition
  --xpath expr: evaluate the XPath expression, imply --noout
  --max-ampl value: set maximum amplification factor

Libxml project home page: https://gitlab.gnome.org/GNOME/libxml2

Installation on mega-linter Docker image

APK packages (Linux):