[news.eclipse.modeling.m2m] [ATL] OrderedSet.indexOf operation not found

[Jevon Wright <jevon@xxxxxxxxx>]

Hi,

I am working on an ATL template that has the following helper definition:

helper context OclAny def: getElementId() :
  String = 'http://openiaml.org/simple#test' +
    if simple!EObject.allInstancesFrom('IN')->includes(self)
    then simple!EObject.allInstancesFrom('IN')->indexOf(self)->toString()
    else 'unknown'
    endif;

The idea behind this template is that I can get a unique ID of an 
element based on its absolute position. However, if I use this against 
an EMF model, I get the following exception message:

  Operation not found: OrderedSet 
{...}.indexOf(org.openiaml.model.owl.simple.simple.impl.InternetApplicationImpl)

If I instead convert this OrderedSet into a Sequence as follows, the ATL 
template works without any errors:


simple!EObject.allInstancesFrom('IN')->asSequence()->indexOf(self)->toString()

This wasn't expected, considering the ATL User Guide [1] says 
OrderedSet.indexOf(o : oclAny) is supported.

Is this expected behaviour? Is any EObject an oclAny? Or is this a 
problem with the documentation?

Thanks!

Jevon

[1]: http://wiki.eclipse.org/ATL/User_Guide#OrderedSet_data_type_operations