I'm developing a system which involves 2 Android applications and a Java web application. For my UML class diagrams I have not included third party classes I use e.g. observer type interfaces. Should I include them? If so how can I differentiate between my entities (classes, interfaces, enums etc) and their entities? Thank you.
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If they are important for understanding your system, yes.
Perhaps a package diagram to clearly show what belongs where. In other diagrams, you could use color to show the difference.