Nesting function calls

When defining application event action parameters, keep these rules in mind:

• PARAMS(…)-type functions can never be nested.
• FUNCTION(…)-type functions must be nested and can be nested either within PARAMS(…) functions or within other FUNCTION(…) functions.
• …WORD…-type functions must be nested within FUNCTION(…)-type functions.

This is an example of an event action parameter that uses nested functions:

PARAMS(…FUNCTION1(…FUNCTION2(…WORD1…)…WORD2…)…)