— could you please recommend me some decent UML editor for Linux?
Dia is decent enough. I have used it in the past.
Recently (through the results of postgresql_autodoc) I started using Graphviz which produces much beter results than what I can achieve with an UML-editor.
Learn the dot-language (part of graphviz). It is not that complicated.
Regards
Johann
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Because experiencing your loyal love is better than life itself, my lips will praise you. (Psalm 63:3)