xml validate — Validate XML documents. More information: <https://xmlstar.sourceforge.net/doc/UG/xmlstarlet-ug.html

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