| _count | Special | eq |  |  | The maximum number of resources to return in a result page. | 
                    
                        | _elements | Special | eq |  |  | Used to request a specific set of elements be returned as part of a resource. | 
                    
                        | _id | Token | :missing | Yes |  | Resource id | 
                    
                        | _lastUpdated | Date | lt
                                le
                                gt
                                ge |  |  | When the resource last changed | 
                    
                        | _summary | Special | eq |  |  | Used to return only a portion of the resouces. Defaults to 'false', which returns the whole resource. | 
                    
                        | _total | Special | eq |  |  | Use the value 'estimate' to populate the result bundle's 'total' element with an estimate of the matching number of resources. | 
                    
                        | name | String | :contains
                                :exact
                                :missing | Yes |  | The name of the value set | 
                    
                        | reference-concept | Token | :not
                                :in
                                :not-in
                                :missing | Yes |  | A code included in the value set
 | 
                    
                        | version | Token | :missing | Yes |  | The version identifier of the value set |