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Level 8

DocInfo is a tag set that is part of the DDX command file.  LiveCycle Assembler uses a DDX file to determine what it is supposed to do to a file.  Have a look at the DDX reference guide: http://livedocs.adobe.com/livecycle/8.2/ddxRef/001000.html

and specifically at the Doc Info part:

  http://livedocs.adobe.com/livecycle/8.2/ddxRef/001170.html

(You can see the table of contents from the above links by clicking on the "Show Navigation" icon in the upper left)