https://bugs.kde.org/show_bug.cgi?id=512808
Bug ID: 512808
Summary: Not possible to use ownership dots at the end of
association ends to show property ownership in UML
diagrams
Classification: Applications
Product: umbrello
Version First 25.11.90
Reported In:
Platform: Flatpak
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: general
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: ---
Created attachment 187272
--> https://bugs.kde.org/attachment.cgi?id=187272&action=edit
Image showing the issue of the missing UML diagram configuration field
SUMMARY
Good day team, according to the current UML standard v2.5.1, it is possible to
show Ownership of Association ends by an associated Classifier. This is done
via the use of a dot at the end that touches the owned Classifier as a
Property.
You can find details in the standard, in chapter 11, specifically in section
11.5.4, in page 202 https://www.omg.org/spec/UML/2.5.1/PDF the relevant part
says:
"""
Ownership of Association ends by an associated Classifier may be indicated
graphically by a small filled circle, which for brevity we will term a dot. The
dot is to be drawn integral to the graphic path of the line, at the point where
it meets the Classifier, inserted between the end of the line and the side of
the node representing the Classifier. The diameter of the dot shall not exceed
half the height of the aggregation diamond, and shall be larger than the width
of the line. This avoids visual confusion with the filled diamond notation
while ensuring that it can be distinguished from the line. The dot shows that
the model includes a Property of the type represented by the Classifier touched
by the dot. This Property is owned by the Classifier at the other end. In such
a case it is normal to suppress the Property from the attributes compartment of
the owning Classifier.
"""
The major usefulness of this ownership dot notation, is that at a glance the
diagram shows whether the Association End is owned by the Association itself,
or by the Classifier on the other end.
STEPS TO REPRODUCE
1. Open Umbrello
2. Create a Class diagram
3. Create two classes in the Class diagram
4. Join them using an Association (doesn't need to be a Directional
Association).
5. Try to show ownership of the Association Ends using the dot specified in the
UML standard.
OBSERVED RESULT
Umbrello has no way of displaying said dot.
EXPECTED RESULT
Umbrello should have a configuration to show this ownership, possibly by going
to Association Properties -> Role settings. See the attachment to see the GUI
screen missing this configuration. In the Role settings screen it could have an
Ownership field, in there the user would set the Ownership to either the
Association (no dot displayed), or to the Classifier (the dot is displayed).
SOFTWARE/OS VERSIONS
Ubuntu 25.10, with Umbrello installed via Discover with the Flatpak backend.
--
You are receiving this mail because:
You are watching all bug changes.
