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9.11 Invoking dzn verify

The dzn verify command exhaustively checks a Dezyne file for verification errors in Dezyne models. See Formal Verification.

dzn dzn-option… verify optionFILE

The options can be among the following:


Show all errors, i.e., keep going after finding an error. By default, verification stops after finding a verification error.


Display help on invoking dzn verify, and then exit.

-I dir

Add directory dir to the import path.

-m model

Limit verification to model, and for a behavioral component model, to its interfaces.

Note: Verification cannot be limited to system component models; verifying a system model is a no-op11.


Do not use a constraining process.


Do not verify interfaces.


Disable the unreachable code check. For large models the unreachable code check may have a serious performance impact.


Run a partial verification pipeline to produce format.

Interesting formats are mcrl2, aut, aut-dpweak-bisim, aut-weak-trace, and aut+provides-aut. Use --out=help for a full list.

The verification pipeline starts by generating mCRL2 code, which is converted into an lps and then into an lts (See Invoking dzn lts). The lts is then manipulated further.

Using the --debug on dzn (See Invoking dzn) shows the pipelines with all their commands that are being used, ready for use on the command line.

-q size

Use component queue size size for verification, the default is 3.


Use defer queue size size for verification, the default is 2.


Use external queue size size for verification, the default is 1.



The compositional property of the Dezyne component-based programming paradigm guarantees that the verification of a system component model amounts to the verification of all its interface models and behavioral component models.

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