The view describes how the edition form or the data tree/list appear on screen. The views can be of ‘Form’ or ‘Tree’ type, according to whether they represent a form for the edition or a list/tree for global data viewing. A form can be called by an action opening in ‘Tree’ mode. The form view is generally opened from the list mode (like if the user pushes on ‘switch view’).
This parameter allows you to regulate which resources are visible in a selected view.(restriction) For example, in the invoice case, you can define an action that opens a view that shows only invoices not paid. The domains are written in python; list of tuples. The tuples have three elements;