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Often it is helpful to iterate over an existing list in order to build a new list, as in the following example:

forEach($name, in.name, 
	if ($name != _NULL, 
		addElement($usableNames, $name) 
	)
)

Using the forEach function we go through every name provided in the variable in.name. We want to get a list of all the names which are not null, so for each one we test the value using the condition $name != _NULL. If the name is not null, we add it to a list called $usableNames using addElement().

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