Similar to others we customize the GUI in the form builder tool where complex logic (hiding controls, looking up values, validation, business logic etc) can be added. It would be a large (but noble) effort to implement that in templates or even separate presentation templates (my preference) for automation.
However my question is if we want true interoperability are we expecting a completed form created in PatientOS to be edited in an external openEHR system? If we are, I can see issues if I determined a field to be a large multiline text field (e.g. comments on this vitals form: http://www.patientos.org/forum_temp/vitals_form.png)) but the external system created a short single text box. The net effect would be visually truncated data - unless it is unreasonable to expect we can swap and edit documents. Perhaps that is just an implementation detail to be hacked out. Greg http://www.patientos.org
