Specifying parameters for actions

In specifying the parameters of an action, remember that, in general, any context that accepts an immediate value of a particular standard data type also accepts any entity of the same data type. For example, if an input field accepts a string value, then it also accepts an expression that evaluates to a string, a value that converts to a string, a string variable, or a call to an imported method that returns a string (see Equivalents).

However, there are a few fields in which you cannot use variables (see Using the value that the variable holds).