How to check whether an expression is a sum of variables of type "name"?

Question:How to check whether an expression is a sum of variables of type "name"?

Posted: Andriy 270 Product: Maple

September 05 2014

I do the following:

restart; 
z := x + y; 
type(z, specfunc(name, `+`));

However the result is 'false'. How to correct my type checking?

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