Hi wp master!
I see in svn watcher, your working hardly for this filetype support.
Today I about finished my own "parser", I can read and write the all cell data with raw value. Besides I can write back the data to the file, and these recreated files same as the original (hash checked!). This is mean, I can simulate the original office xml line-breaking system too. I test it with about 150 file, and all hash is equal. This is exactly, what I want (raw value, and reproduce the same xml structure).
Anyway, thank you wp master for your many help and support!