Slicer  4.13
Slicer is a multi-platform, free and open source software package for visualization and medical image computing

MRMLDM → MRML Relation

File in Modules/Loadable/Markups/MRMLDMIncludes file in Modules/Loadable/Markups/MRML
vtkMRMLMarkupsDisplayableManagerHelper.hvtkMRMLMarkupsNode.h