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What is XML?
Extensible Markup Language is a strict, tag-based format for storing and transporting structured data defined by W3C. It supports schemas and namespaces for rigorous validation.
Related tools
Try these DevStackIO tools for XML:
XML Formatter/ValidatorFormat and validate XML with indentation and well-formedness checks. Use for XML; for JSON use json-formatter, for XML to JSON conversion use xml-to-json. Input: XML ≤10MB. Returns formatted XML or line-numbered error. 100% client-side.Open tool →XML to JSON ConverterConvert XML to JSON preserving attributes and nesting. Use for XML input only; for reverse use json-to-xml. Input: XML ≤10MB. Returns JSON or XML parse error. 100% client-side.Open tool →
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About this glossary
Definitions are written in plain language and sourced from MDN Web Docs, W3C specifications, and RFCs. Related tools run 100% in your browser — no data leaves your device.
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