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XML has become popular in the design of many Domain-Specific Markup Languages (sometimes called XML Vocabularies).  This is because the data  in an XML document is largely self-describing, is simple to parse, and is very portable, in contrast to many often poorly documented or undocumented proprietary formats.

For example, here are some XML-based domain-specific markup languages:

• OFX (Open Financial Exchange Format)
• CML (Chemical Markup Language)
• MathML (Mathematical Markup Language)
• SMIL (Synchronized Multimedia Integration Language)
• OSD (Open Software Description)
• SVG (Scalable Vector Graphics)
• MusicML