Check the "Final text" here:
http://www.y-adagio.com/public/committees/iec_pt62448/cmt_pt62448.htm
It doesn't describe all the features used by Sony (e.g. it mentions <Solo> just in passing) but still a great LRS reference.

Intersting....

Tnks!

So LRS (AKA BBeB Xylog) files are the XML source files for LRF right? Are there any samples of these? From what I can read lrs2lrf can do the conversion, but it requires a DLL from Book Creator, which I can't seem to find anywhere. Is still available for download?

You can make LRS files:
1) with Book Creator
2) with BookDesigner (it puts the intermediate .lrs in the temp directory)
3) with lrf2lrs
Here's a link which has Book Creator: http://silicondependency.googlepages.com/bookcreator%40librie

You can make LRS files:
1) with Book Creator
2) with BookDesigner (it puts the intermediate .lrs in the temp directory)
3) with lrf2lrs
Here's a link which has Book Creator: http://silicondependency.googlepages.com/bookcreator%40librie
Thanks igorsk! I think that BookDesigner deletes the temp file before I can snag it, but Book Creator gave me what I want.

Boy it sure would be nice to see the source code for lrs2lrf and the DLL from Book Creator. Can we get those guys to make their code open source? It sure would make generating content for the Sony Reader a lot easier on other platforms.