When a particular data element within the component is selected, the set of attributes or fields for this element can be seen and updated. For instance, additional attributes can be created by clicking on the “+” in the tab Fields. As a first choice, the user should determine (via the bullets at the top of the screen) whether he or she wants to create a value field (new value entered), link field (value linked to an already existing data element) or calculated field (value calculated based on other fields).