[ros-users] [Discourse.ros.org] [general] Classifying Dependencies in package.xml

[David!!]

I'm trying to familiarize myself with [ROS Package Format 2](http://docs.ros.org/indigo/api/catkin/html/howto/format2/index.html) and the general structure of ROS dependencies. 

I've sketched out some Venn diagrams in [a Google Slides presentation](https://docs.google.com/presentation/d/1eycRdYwySVjxS48cSjYUrWI8mCi1nm7opGL2oIgwpUg/edit?usp=sharing), which is open for comments. 

I have the basic use cases down (I think) but would appreciate feedback on what I'm missing and where I've misclassified things.






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