https://onesoftware.atlassian.net/spaces/OEN/pages/460357589/The+Calendar+View
(start1.before(start2) && end1.after(start2)) ||
(start1.before(end2) && end1.after(end2)) ||
(start1.before(start2) && end1.after(end2))
The Edit View
The edit view displays one entity in a form, allowing the user to view or change the properties.
Catalogs
A catalog is a type of entity that can be related to another entity and it defines a set of options. When a catalog is displayed in an edit-view it uses a drop-down list control. Sometimes catalogs are called picklists by developers.