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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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Topic Maps is an excellent paradigm to support human thinking and to visualize networked information. As part of my PhD project, I therefore chose Topic Maps as the conceptual foundation for designing and implementing a software prototype for semantic knowledge retrieval.

Stefan Smolnik
Topic Maps Lab auf der Cebit 2011

Graduate from the Topic Maps Lab