XML

Updated 05 Oct 2026

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What it is
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  a markup syntax for structured documents with explicit well-formedness requirements
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Rules
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  elements must nest correctly, names are case-sensitive, and required closing syntax must be present
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  a well-formedness error is normally fatal to ordinary XML parsi
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Distinction
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  parsing mode depends on how the content is served or parsed, not merely on a filename extension
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  XLM well-formedness and validity against a schema are separate checks
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  markup can be well-formed XML while violating HTML content rules
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Related
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  HTML
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  HTML Parsing

Linked references 2