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*in-interpreter*

Variable
Summary

Allows code to detect when it is running in a rule.

Description

The variable is bound to t if the code executing has been called (directly or indirectly) from the forward chaining rule interpreter. Otherwise it bound to nil . The value should not be changed.

Initial Value

nil


KnowledgeWorks and Prolog User Guide (Unix version) - 6 Dec 2011

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