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As mentioned in https://www.eclipse.org/forums/index.php/t/1074429/, the documentation is not consistent regarding the capability to create filters in DiagramExtensionDescription: > A Diagram Extension can specify the Metamodels of the semantic elements it represents > if it supports types of elements which were not represented in the extended diagram. > Inside a Diagram Extension, you can define validation rules, filters and additional > layers. > http://www.eclipse.org/sirius/doc/specifier/diagrams/Diagrams.html#diagram_extension Specifier can create Concerns, but this concept is de facto deprecated as it no more shown to the end user: it used to be displayed in old ui as a combo/dropdown button around layers and filters combo/drop down button. I suggest we completely remove this concept from the metamodel.