How closure work in acceleo?

I have a element with a child element name nextElement

a.nextElement is b
b.nextElement is c
c.nextElement is d

When I do a request a->closure(a.nextElement) I expect to get a set with b, c and d but I only get b. What I am not understanding or doing wrong?

Solution

Have you tried something like?:

a -> closure(child:Element | true)

true is an expression. You can specify there any condition you need.

I saw it here

Even though I'm not sure that closure is included in Acceleo API (I repeat, not sure). I tried to use closure function but the IDE didn't suggested it to me.

In my project, I made this generic query by my own:

[query public descendants(aElement : Node): 
    Set(Node) =  if (aElement.oclIsTypeOf(Element)) then
                        Set{aElement} -> union (aElement.oclAsType(Element).children 
                            -> collect (n : Node | descendants(n)) -> asSet() )  
                    else
                        Set{aElement}
                    endif 
    /]

I hope this would help !!!