&= (logical AND assignment)

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Baseline

To make it easier to write rules succinctly, you can use the assignment:

$TheAttribute &= expression;

…which sets $TheAttribute to be true only if it is currently true AND the expression is also true. Thus, if $TheAttribute is false, the expression is still checked. An attribute that has no value set (or inherited) is evaluated as false.

For example:

$Urgent &= any(children,$Urgent)

Thus a project is considered urgent if it has been declared to be urgent itself and if any child is urgent.