superclass: object%  | 
An editor-data% object contains extra data associated to a snip or region in an editor. See also Editor Data.
The element returned by get-next is initialized to #f.
(send an-editor-data get-dataclass)  | 
→ (or/c (is-a?/c editor-data-class%) false/c)  | 
Gets the class for this data.
→ (or/c (is-a?/c editor-data%) false/c)  | 
Gets the next editor data element in a list of editor data elements. A #f terminates the list.
(send an-editor-data set-dataclass v) → void?  | 
v : (is-a?/c editor-data-class%)  | 
Sets the class for this data.
v : (or/c (is-a?/c editor-data%) false/c)  | 
Sets the next editor data element in a list of editor data elements. A #f terminates the list.
f : (is-a?/c editor-stream-out%)  | 
Specification: Writes the data to the specified stream, returning #t if data is written successfully or #f otherwise.
Default implementation: Returns #f.