| Category | A class to represent a selection of files. |
| DisplayableSet | A class to repreent a selction of DisplayableUpload objects |
| DisplayableUpload | this class represents the information needed to display an upload on frontend web interface. |
| Download | A class to represent the information about the download of a file. |
| DownloadSet | A placeholder type that represents a set of download objects. |
| FieldDefinition | A class to represent a single field definition. |
| FileType | A class to represent file type information. |
| Filter | This class is used to hold parameters representing a filter. |
| FilterResultset | An abstract class to allow iterating, counting, and paginationg the output from a filter. |
| TimeLimitedUpload | An object to represent a time limited URL to a file. |
| Upload | A class to represent an uploaded file. |
| UploadSet | This is a placeholder type that defines a set of uploads. |
| YouSenditUpload | A class to represent a file created via the yousend it interface. |