Summation provides a wide array of white papers in Adobe PDF format. To download, please visit their website: http://www.summation.com/papers/
One white paper of note is "A Complete List of DII Tokens". This 11 page document contains a "complete list of DII tokens used in Summation Blaze LG, LG Gold, and iBlaze Version 2.6. It includes, but is not limited to, all recent tokens added to handle the loading of eDiscovery into Summation using a DII file".
If you want to understand that .DII file, then download a copy.
To learn more about Summation, please visit http://www.summation.com.