I am trying to create a CLI which optionally takes on ROI as input. Based on the doc[1] and using the MultiResolutionAffineRegistration as an example[2], I am using the following XML description:

<region multiple="false" coordinateSystem="lps">
<name>imageROI</name>
<label>Image ROI</label>
<channel>input</channel>
<longflag>imageROI</longflag>
<description><![CDATA[Label image which defines a ROI of interest for the fixed image]]></description>
<default/>
</region>

For either mine or the existing CLI, I can't seem to find an ROI, or ROI list/hierarchy in the parameter pull down.

Indifferent to multiple attributes in the region tag, in the pull down menu I am getting a selection of Rename/Create/Delete ROIList. Upon creating the node type is a vtkMRMLROIListNode defaulting to the name "Image ROI".

When I create a new ROI node, from the toolbar mouse tool, it creates a region, under a vtkMRMLAnnotationHierachyNode, but it's call "ROI List".

I am not sure what the expected behavior of this is and if I am just using it wrong or if these are bugs.

In summary I have two issues:

1) the multiple attribute of region didn't have the of searching for a individual ROI node
2) the region parameter suppose to be searching for a ROIListNode or a AnnotationHierachyNode?

My initial thought is that bit of code didn't get updated at some point. And that a fairly simple change to the code to something similar to what I did in SimpleFilters for Fiducial points [3],4] would need to be done here.

[1] http://www.slicer.org/slicerWiki/index.php/Slicer3:Execution_Model_Documentation
[2] https://github.com/Slicer/Slicer/blob/master/Modules/CLI/MultiResolutionAffineRegistration/MultiResolutionAffineRegistration.xml
[3] https://github.com/SimpleITK/SlicerSimpleFilters/blob/master/SimpleFilters/SimpleFilters.py#L395
[4] https://github.com/SimpleITK/SlicerSimpleFilters/blob/master/SimpleFilters/SimpleFilters.py#L395