This element represents a user membership in an application role. When the parent component of this element is installed, the user will be added to the associated application role. This element must be a descendent of a Component element; it can not be a child of a ComPlusApplicationRole locater element. To reference a locater element use the ApplicationRole attribute. Identifier for the element. If the element is not a child of a ComPlusApplicationRole element, this attribute should be provided with the id of a ComPlusApplicationRole element representing the application role the user is to be added to. Foreign key into the User table.