Validate XML
Check XML for malformed tags, mismatched elements and invalid declarations.
Based on: W3C Extensible Markup Language (XML) 1.0
About this validation
Checks XML well-formedness and document structure according to the XML specification. This check validates syntax and well-formedness only -- it does not imply validation against a custom XML schema (XSD/DTD).
- Protocol / standard:
- Rules reviewed:
- Aug 31, 2026
Standards and vendor-documented behavior can change. This reflects the source as last reviewed above, not a permanent guarantee.
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