OCL21 — doubts about the iterator variables

I have a few doubts about the iterator variables. Reading the specification I am not sure about, for each iterator, how many iterator variables can have. Looking at sections 7.6 and 11.9 my conclusion in the following: -select --> It has zero or one iterator variables. (0..1) -reject --> It has zero or one iterator variables.(0..1) -collect --> It has zero or one iterator variables.(0..1) -forAll --> There is no restriction about the number of iterator variables. (0..) -exists --> Unlike forAll, in section 7.6 there is no text saying anything about the number of variables. But in section 11.9 it seems that it is the same case that forAll. (0..) -iterate --> It has one iterator variable. -collectNested --> It has zero or one iterator variables.(0..1) -one --> It has zero or one iterator variables.(0..1) -any --> It has zero or one iterator variables.(0..1) -isUnique -->It has zero or one iterator variables.(0..1) Is my conclusion correct in everything? or in wich parts am I confused? How can the most of the iterators be defined by the iterate iterator if iterate iterator can have only one variable iterator? I think the iterate iterator should not have restrictions about the number of iterator variables (0..*).

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