| Name | Kind | Description |
| OAuthInfoPacket | class | This OAuth packet would pass authentication from one system to another. There are existing standards such as SAML 2.0 that can be incorporated here. |
| OauthToken | class | |
| OldMultiplicity | attribute | The old mutiplicity of the NIEM property that implements the source class or property |
| OldXPath | attribute | Old XML mapping to the NIEM |
| OtherUserMetadata | attribute | All other metadata collected from the user session and interaction. |
| Outcome | class |