The big mistake @EL84 made was selling his suggestion as talking about the data model. Do a programmer this means the backed representation of data or the file format.
I am not sure if this really was the intention. Some (you included) suggested above that they really talk about how the user could interact with the underlying data model. But if that is the case then this was not communicated explicitly. (And programmers like all people are not yet able to read the mind of others. So they can only work with the information that is there in an explicit way.)