| Interface | Description | 
|---|---|
| Principal | 
 This interface represents the abstract notion of a principal, which
 can be used to represent any entity, such as an individual, a
 corporation, and a login id. 
 | 
| Class | Description | 
|---|---|
| AccessRolePrincipal | 
 Access role principal (uses access role URI as identifier). 
 | 
| IdentityPrincipal | 
 Identity principal (uses UID as identifier). 
 | 
| UESPrincipal | 
 Default UES principal. 
 |