Umbrello supports Interface Inheritance aka Realization. A related section is missing in the "class diagram" part of the umbrello manual. This has been requested by emma.atkinson2@gmail.com as part of bug 322019
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This bug has been in NEEDSINFO status with no change for at least 30 days. The bug is now closed as RESOLVED > WORKSFORME due to lack of needed information. For more information about our bug triaging procedures please read the wiki located here: https://community.kde.org/Guidelines_and_HOWTOs/Bug_triaging Thank you for helping us make KDE software even better for everyone!