A startup script is uniquely identified by its key and its type.
A feed is a uniquely identified, titled, and time-stamped collection of syndicated resource entries.
You may already be aware that an encyclopedia contains objects that are uniquely identified by their GUID.
A class loaded by a class loader instance is uniquely identified by that class loaders namespace and the class name.
The unit can contain artifact(s) where each of the artifact instances is uniquely identified by its name within the scope of a unit, as shown in Listing 22.
