Web Reference: Validate XML documents using the W3Schools XML Validator and ensure their correctness with step-by-step instructions and examples. This tool checks your XML for syntax errors like unclosed tags, mismatched elements, invalid characters, and missing declarations — giving you clear error messages with line numbers so you can fix issues fast. XML validator will check for both well-formedness and validity. It will also give you helpful error messages so you can fix any issues in your XML. The XML syntax rules are less stringent compared to the formal rules of well-known languages like Java or C.
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