Locate parser errors
Validation reports a message, line, and column to help you find malformed markup quickly.
XML Validator
Validate XML syntax and locate mismatched tags, malformed attributes, and other well-formedness errors.
XML validator
Check whether an XML document is well formed.
Valid XML
The document is well formed.
XML input
Well formed is not schema valid
This checks XML syntax. It does not validate an external XSD or DTD vocabulary.