Frequently touched aspects by (most) users of GEOS with examples
Resource (Configuration) Files (introduce the YAML approach?)
Adding a field or field bundle (including how to use VarSpec)
ExtData
History
etc
More examples geared towards users who are also developers of GEOS components
MAPL App from scratch
I would propose 3 complete MAPL Applications that create simple grid comps in order of complexity with voluminous comments and that demonstrate all the topics listed earlier. A driver that creates a single gridcomp (no MAPL cap), a driver that creates two and demonstrates connectivity (no MAPL cap), a mini geos that uses MAPL cap, has a simple gridcomp structure, maybe a root with 2 children, could provide files for example that would output something in history with this.
Could also have simple Applications (no grid comp) to demonstrate basic ESMF and some MAPL utilities, ideas - how to create a grid, fields, the MAPL regridding layers.
How to add a new GridComp (model, history, coupler, etc)