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Topic Maps — Constraint Language (TMCL, ISO 19756)


The Topic Maps Constraint Language (TMCL) is a language for defining schemas and constraints on topic map models.

This International Standard defines a Topic Maps vocabulary for representing constraints on Topic Maps ontologies, defined using English prose. The vocabulary is defined in terms of validation, that is, verifying whether or not a given topic map conforms to the constraints. It may have many other applications, but these are not described in this International Standard.

The full standard text is available here.

The current development and the open issues can be viewed here.

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TMCL is the abbreviation for Topic Maps Constraint Language.


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In Musica migrans we mapped the life courses of musicians in the 19th century. Topic Maps provides us the flexibility we need to model the diversity in the lives of the artists.

Lutz Maicher
Musica Migrans
Topic Maps Lab auf der Cebit 2011

Graduate from the Topic Maps Lab