Rule Builder > Technical Rule Language Reference > Tokens for the Condition Part of a Rule > there is no |
there is no |
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The token there is no
inserts a "not condition", which is true when there is no instance of an object in the working memory. When you click this token and expand the square brackets, the following code is displayed:
WHEN
there exists no [ event ] <select a class> [ from <enter a value> ]
[where]
[such that]
The token there is no
is composed of the subtokens given in Table 24.2:
[event] | Declare an event object. |
<select a class> | Declare the name of a class. |
[from <enter a value>] | Insert a from or in expression.
|
[where] | Insert attributes of the class and bind them to local variables. |
[such that] | Insert tests on attribute values. |
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