...
trunk = main/project_N:refs/heads/master
branches = offshoots/*/project_N/*:refs/heads/*/*
tags = snapshots/*/project_N/*:refs/tags/*/*
...
trunk = main/project_N:refs/heads/master
branches = offshoots/*/project_N/*:refs/heads/*/*
tags = snapshots/*/project_N/*:refs/tags/*/*