tldr/pages/common/xml-validate.md

# xml validate

> Validate XML documents.
> More information: <https://xmlstar.sourceforge.net/doc/UG/xmlstarlet-ug.html#idm47077139576400>.

- Validate one or more XML documents for well-formedness only:

`xml {{[val|validate]}} {{path/to/input1.xml|URI1 path/to/input2.xml|URI2 ...}}`

- Validate one or more XML documents against a Document Type Definition (DTD):

`xml {{[val|validate]}} {{[-d|--dtd]}} {{path/to/schema.dtd}} {{path/to/input1.xml|URI1 path/to/input2.xml|URI2 ...}}`

- Validate one or more XML documents against an XML Schema Definition (XSD):

`xml {{[val|validate]}} {{[-s|--xsd]}} {{path/to/schema.xsd}} {{path/to/input1.xml|URI1 path/to/input2.xml|URI2 ...}}`

- Validate one or more XML documents against a Relax NG schema (RNG):

`xml {{[val|validate]}} {{[-r|--relaxng]}} {{path/to/schema.rng}} {{path/to/input1.xml|URI1 path/to/input2.xml|URI2 ...}}`

- Display help:

`xml {{[val|validate]}} --help`