nsITransferable Interface

 Add the data flavor, indicating that this transferable 
 can receive this type of flavor

 @param  aDataFlavor a new data flavor to handle

void addDataFlavor(in string aDataFlavor)

 Computes a list of flavors (mime types as nsISupportsCString) that the transferable 
 can export, either through intrinsic knowledge or output data converters.

 @param  aDataFlavorList fills list with supported flavors. This is a copy of
          the internal list, so it may be edited w/out affecting the transferable.

nsISupportsArray flavorsTransferableCanExport()

 Computes a list of flavors (mime types as nsISupportsCString) that the transferable can
 accept into it, either through intrinsic knowledge or input data converters.

 @param  outFlavorList fills list with supported flavors. This is a copy of
          the internal list, so it may be edited w/out affecting the transferable.

nsISupportsArray flavorsTransferableCanImport()

 Returns the best flavor in the transferable, given those that have
 been added to it with |AddFlavor()|

 @param  aFlavor (out parameter) the flavor of data that was retrieved
 @param  aData the data. Some variant of class in nsISupportsPrimitives.idl
 @param  aDataLen the length of the data

void getAnyTransferData(out string aFlavor, out nsISupports aData, out unsigned long aDataLen)

 Given a flavor retrieve the data. 

 @param  aFlavor (in parameter) the flavor of data to retrieve
 @param  aData the data. Some variant of class in nsISupportsPrimitives.idl
 @param  aDataLen the length of the data

void getTransferData(in string aFlavor, out nsISupports aData, out unsigned long aDataLen)

 Returns true if the data is large.

boolean isLargeDataSet()

 Removes the data flavor matching the given one (string compare) and the data
 that goes along with it.

 @param  aDataFlavor a data flavor to remove

void removeDataFlavor(in string aDataFlavor)

 Sets the data in the transferable with the specified flavor. The transferable
 will maintain its own copy the data, so it is not necessary to do that beforehand.

 @param  aFlavor the flavor of data that is being set
 @param  aData the data, either some variant of class in nsISupportsPrimitives.idl,
         an nsIFile, or an nsIFlavorDataProvider (see above)
 @param  aDataLen the length of the data, or 0 if passing a nsIFlavorDataProvider

void setTransferData(in string aFlavor, in nsISupports aData, in unsigned long aDataLen)