Ah! I see what you saying now...
I guess you could find all the related tables and do a single sql scripts that gets all the related records for a particular learning design. BUT, this won't export any files uploaded into the learning design. So you might only get half of the content. See here for some of the data model relationships though http://is.gd/gTHsh
The big advantage of the zip file is that it contains both. If you want just the data structure, parse the .xml files in the zip and that will give you the data and relations between the design and its activities. Additionally it gives you the files uploaded by the teacher (images, videos, documents, etc).
I hope that helps,
Ernie
Posted by Ernie Ghiglione