Salesforce Chatter Documents
The document reference for a document created by the Salesforce Chatter Connector uses the following format:
CHATTER:<authenticated_user_id>:[TYPE]:<id>
where [TYPE] specifies the type of document and is one of the following values:
| USER | The document contains the details of a single user. | 
| GROUP | The document contains details of a collaboration group. | 
| FILE | The document represents a file retrieved from the repository. | 
| CONVERSATION | The document represents a private conversation. | 
| MESSAGE | The document represents a message from a private conversation. | 
| ITEM | The document represents an item in the user's news feed. | 
| COMMENT | The document represents a comment attached to a feed item. | 
Most of these document types contain fields that reference other documents. For example, the CONVERSATION document type does not include the message content, but includes a reference to the associated MESSAGE documents.