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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 (Macintosh version) - 24 Mar 2017

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