| AffectedInfo |  | 
| Association | This class allows one to relate a source and target registry object along a
 named relationship. | 
| AuditableEvent | AuditableEvent instances provide a long-term record of events that effected a
 change in a RegistryObject. | 
| Classification | A Classification instance classifies a RegistryObject instance by referencing
 a node defined within a particular ClassificationScheme. | 
| ClassificationNode | ClassificationNode instances are used to define tree structures where each
 node in the tree is a ClassificationNode. | 
| ClassificationScheme | A ClassificationScheme instance describes a taxonomy. | 
| ExternalIdentifier | ExternalIdentifier instances provide the additional identifier information to
 RegistryObject such as DUNS number, Social Security Number, or an alias name
 of the organization. | 
| ExternalLink | ExternalLinks use URIs to associate content in the registry with content that
 MAY reside outside the registry. | 
| ExtrinsicObject |  | 
| Identifiable |  | 
| Link | Simple class to capture references to be used in HTTP headers or in responses | 
| ObjectRef |  | 
| PagedResponse<T> | A class to wrap list responses from the registry with. | 
| RegistryObject | The RegistryObject class extends the Identifiable class and serves as a
 common super class for most classes in the information model. | 
| RegistryObjectList |  | 
| RegistryPackage | RegistryPackage instances allow for grouping of logically related
 RegistryObject instances even if individual member objects belong to
 different Submitting Organizations. | 
| ReplicationReport |  | 
| Report |  | 
| Service | Service instances describe services, such as web services, web sites, FTP
 servers, etc. | 
| ServiceBinding | ServiceBinding instances are RegistryObjects that represent technical
 information on a specific way to access a Service instance. | 
| Slot |  | 
| SpecificationLink | A SpecificationLink provides the linkage between a ServiceBinding and one of
 its technical specifications that describes how to use the service using the
 ServiceBinding. |