I've seen several discussions on the net about how great it would be to have an XML schema or DTD for logback.xml file to have at least the very basic validation and auto-completion in IDEs like IDEA or Eclipse, but I never saw any solution.
Did you?
It is not supported officially according to the documentation, but there is an independent project to provide Schema for Logback
However, due to extreme flexibility of the Logback configuration, Schema cannot support all possible configuration options.