Animate MX 2004.
item.linkageIdentifier
Property; a string that specifies the name Animate will use to identify the asset when linking to the destination SWF file. Animate ignores this property if item.linkageImportForRS, item.linkageExportForAS, and item.linkageExportForRS are set to false. Conversely, this property must be set when any of those properties are set to true.
The following example specifies that the string my_mc will be used to identify the library item when it is linked to the destination SWF file to which it is being exported:
fl.getDocumentDOM().library.items[0].linkageIdentifier = "my_mc";