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- MARCXML: a schema developed by the Library of Congress to enable the sharing and accessing of bibliographic information
- MathML: a language describing mathematical notation
- Medical Markup Language
- MapjectsFML: a declarative Mapjects language describing mathematical fraud probability in transactions also supports interop for IFX
- Medical Reality Markup Language (MRML)
- Microformats: a piece mark up that allows expression of semantics in an HTML (or XHTML) web page
- MOWL: semantic interactions with multimedia content
- Music Encoding Initiative (MEI): an XML-based language for digital representations of music notation documents.
- Music Markup Language
- MusicXML: an XML-based music notation file format.
- MXML: a language used to declaratively lay-out the interface of applications, and also to implement complex business logic and rich internet application behaviors
Read more about this topic: List Of XML Markup Languages