com.nomagic.magicdraw.uml.symbols.DiagramPresentationElement is a one to one mapping to UML com.nomagic.uml2.ext.magicdraw.classes.mdkernel.Diagram. It means for every Diagram in a model exists one and only one DiagramPresentationElement. Use com.nomagic.magicdraw.core.Project.getDiagram(Diagram) to get it for a Diagram.

The purpose of this presentation element is to manage all other presentation elements used in a Diagram: