Document attribute defaults are the result of all of the processes already described and are effectively the baseline for attributes' default values once a document is created. System attribute defaults are documented. New user attributes take their data-type defaults.
The document is the highest possible level for configuration of User attributes, as they only exist in a document if added by the user.
Document defaults can always be reviewed—or indeed altered, where allowed—using the Document Inspector's System and User tabs.
Next, the role of prototypes…