Value range definitions (also known as domain definitions) allow value ranges to be defined and named for table columns.
Each value range definition has a unique name within the overall database system. If a value range has been defined without an owner being entered, the database system searches for the value range in the catalog parts in the following order:
...
1. Catalog part of the current user
2. Catalog part of the database administrator who created the current user
3. Catalog part of the database system administrator
See also:
Reference Manual, Domain Name