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6.4.3 Subrule Invokations

A subrule is invoked when an expression subrule(value1, value2, ...) is evaluated.

The expression yields the value that is returned by the return statement in the subrule. The number of parameters in a subrule invokation must match the number of parameters in the subrule definition.

There is a number of default subrules which are predefined. They are called functions.