design constraint: de-coupling of data and interface

[ahdinosaur]

much like there are many email interfaces or IM interfaces, we want to support many "directory" interfaces, or "marketplace" interfaces, or whatever that focus on being an interface for specific services.

it's in the docs, just think maybe we should emphasize and describe it more.

[elf-pavlik]

handy links: https://unhosted.org/ & http://decoupledcms.org