The subject matter discussed in the background section should not be assumed to be prior art merely as a result of its mention in the background section.  Similarly, a problem mentioned in the background section or associated with the subject matter of the background section should not be assumed to have been previously recognized in the prior art.  The subject matter in the background section merely represents different approaches, which in and of themselves may also be inventions. 
In conventional document management systems, users access their documents stored in one logical storage space.  A user of such a conventional system typically retrieves documents from, and stores documents on, the system using the user's own systems.  A user system might remotely access one of a plurality of server systems that might in turn access the document management system.  Document retrieval from the system might include the issuance of a query from the user system to the document management system.  The document management system might process such a request received in the form of a query and might send to the user system information about documents stored in the document management system that are relevant to the request.  The ability to share documents among multiple individuals, the ability to provide the retrieval of accurate information relating the shared documents, and the ability to deliver this information to the user system are desirable characteristics of document management systems in general. 
Unfortunately, such conventional approaches suffer from the flaw that, searching only the shared documents for particular topics of interest may be cumbersome, because the shared documents may be located in many places and because there may be many shared documents.  Additionally, a conventional categorization may be inadequate, because the categories may be inappropriate and the categorization decided upon by the classifier, if the classifier is not as familiar with the document as the users, may be inaccurate. 
Accordingly, it is desirable to provide improved techniques enabling the storing and searching of a document that is being shared by multiple users of the document management system.