Raw Data in Parameters
Some application commands return values that do not belong to any of the normal AppleScript value classes. An example is the Edit Graphic command supported by some graphics applications. The values that are returned belong to the class Data, which is described in Chapter 3, "Values." Values of class Data cannot be displayed by AppleScript, but they can be stored in variables and sent as parameters in other commands. For example, if it's necessary to use two different applications to edit a graphic, the data value returned by one
Edit Graphic command can be sent as the direct parameter of another Edit Graphic command.If an application returns values of class Data, its documentation should say so.