Few lines describing the specification of an optional area

• Optional is a property of an Area definition. Default value is false.
• An optional Area does not create automatically a node on page rendering.
• To create an area the user has to click on the button "Create Area" from the Area Bar.
• A click on the "Create Area" button triggers the creation of the node in the content. Then the Area Bar displays two actions: "New" and "Remove Area".
• Click on "New": open a dialog listing the components you can add to the page
• Click on "Remove Area": remove the node from the content. Edit bar displays "Create Area"