---
name: "mono-xmltool"
section: "1"
platform: "linux"
package: "mono"
version: "6.12.0.206-1"
release: "Arch Linux 2026-11-01"
platforms: ["linux"]
url: "https://new.carta.tech/mono-xmltool"
---

# mono-xmltool(1)

Mono XML validation and transformation tool.

## NAME

mono-xmltool - Mono XML validation and transformation tool.

## SYNOPSIS

**mono-xmltool --validate \[\*.rng \| \*.rnc \| \*.nvdl \| \*.xsd\] \[instances\]**

**mono-xmltool --validate-rng relax-ng-grammar-xml \[instances\]**

**mono-xmltool --validate-rnc relax-ng-compact-grammar-file \[instances\]**

**mono-xmltool --validate-nvdl nvdl-script-xml \[instances\]**

**mono-xmltool --validate-xsd xml-schema \[instances\]**

**mono-xmltool --transform stylesheet instance-xml**

**mono-xmltool --prettyprint \[source \[result\]\]**

## DESCRIPTION

*mono-xmltool* is a command line front end for various functions available in the Mono XML class libraries. It currently it offers validation with various different kinds of schemas, xslt transformations and pretty printing.

## XML VALIDATION

mono-xmltool can validate a given set of XML files (the instances parameter) using the given schema file.  Currently supported schema files include Relax NG (\*.rng), Compact Relax NG (\*.rnc), Namespace-based Validation Dispatching Language (\*.nvdl) and XML Schema (\*.xsd).

If invoked with the --validate argument, Mono will use the filename extension to guess the kind of validation required.  The --validate-xxx flags would force a specific kind of validation.

The following lists the flags and the actual class that implements them in Mono:

- *--validate-rng*

  Commons.Xml.Relaxng.RelaxNgPattern as the schema, and Commons.Xml.Relaxng.RelaxngValidatingReader validator.

- *--validate-rnc*

  Commons.Xml.Relaxng.RncParser as the schema, and Commons.Xml.Relaxng.RelaxngValidatingReader validator.

- *--validate-nvdl*

  Commons.Xml.Nvdl as the schema and Commons.Xml.NvdlValidatingReader validator.

- *--validate-xsd*

  System.Xml.Schema.XmlSchema as the schema and uses System.Xml.XmlValidatingReader as the validator.

## TRANSFORMATIONS

This does an XSLT transformation. The stylesheet must be an XSLT file, the instance-xml is the document to be processed.  Output it sent to the standard output.

## PRETTY PRINTING

Produces a pretty-print rendering of the  *source* file.  If it is not specified it reads the standard input.   If  *result* is not specified, the output is sent to the standard output.

## MAILING LISTS

Mailing lists are listed at the http://www.mono-project.com/community/help/mailing-lists/

## WEB SITE

http://www.mono-project.com

## SEE ALSO

**[mono(1)](/mono/1.md),**[mcs(1)](/mcs/1.md).