A manifestation () references a model element that is to be included in
the model component.
A use () shows that a model component depends on another model
component.
Only high-level packages can be manifested (in other words, packages situated directly under the model root). The model root cannot be manifested.
Model elements deployed in a project by a model component are in read only mode, and cannot therefore be modified. They can, however, be used by other elements.