Represents a binding of a view (UI component) to a view model.

Binding is usually created directly when an archetype is beeing created. For example list archetype contains one particular binding called 'callOpen' which allows client to define what action should happened when she click on the list row. The default action is usually opening entity detail with the selected row data, but it can teoretically be any custom JS code. Because we don't know what exact code will be invoked when the action happened, there is a possibility to include {@code $callOpen$} into the HTML template and if the archetype contains such binding item, it will be translated to the custom action defined by user.