Tagged text - tag doesn't match reference

Hi all,

I haven't looked into tagged text before, 

I found a reference to tagged text here and it seems to be the most current one. (Still from CS4?!?)

However, in looking at my tagged text (for a break character), I have "<cNextXChars:Box>" whereas the linked reference shows 
"Valid values include Column, Page, BoxBreak, OddPage, and EvenPage."

Is there a newer reference available somewhere?
Thanks