[SOLVED] CLIPS Error: Illegal use of the module specifier in clipspy

CLIPS Error: Illegal use of the module specifier in clipspy

I'm using clipspy. I want to define some module-rules to assert module-facts. The rule is based on facts from multiple modules. I get a CLIPS Error:

Illegal use of the module specifier

import clips 

env = clips.Environment()

env.build("(defmodule module1)")
env.build("(defmodule module2)")

env.build("(deftemplate module1::X (slot A) (slot B))")
env.build("(deftemplate module2::Y (slot C) (slot D))")

env.build("(defrule module2::rule1 (module1::X (A ?A) (B One) => (printout t hello crlf))")

print(env.find_rule("module2::rule1)

I learned that if I define a rule within a module using the fact from the same module, I don't get the error.

env.build("(defrule module1::rule1 (X (A ?A) (B One) => (printout t hello crlf))")

print(env.find_rule("module1::rule1))

I want to construct a rule using facts from multiple modules. I don't get the error when working with Jess but I run into this problem when using clipspy.

Solution

In CLIPS, you use the export and import keywords in the defmodule definition to share constructs between modules (section 10.4, Importing and Exporting Modules, in the Basic Programming Guide). A pattern can't reference a deftemplate in another module using a module specifier (e.g. module1::X).