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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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As a former information scientist, I am fascinated since 1999 by the capabilities for building Topic Maps-based knowledge systems having the potential to augment human mind. One can model arbitrary knowledge organization systems, deal with semantic heterogeneity, collocate all facts about one subject in one logical place, and with TMQL have semantic retrieval on federated semantic networks. Therefore I expect bright prospects for business concepts building on the exchange of such knowledge snippets via semantic knowledge services.

Alexander Sigel
Topic Maps Lab auf der Cebit 2011

Graduate from the Topic Maps Lab