The element <functionalItemIdent>, contrary to the attribute id, semantically identifies the functional item as a result of its attributes.A functional item can be used to uniquely identify an item performing a function in a given system at a given position for a given Product.For example a functional item can be the third pump in a hydraulic system for a given Product. Depending on the Product instance, this functional item can be mechanical or electrical and, so, can perform the function of a hydraulic pump.The functional item is also known as the reference designator.The codification of functional item identifier is up to the project or the organization.