need TextIters at TextTags positions from TextBuffer

[Emanuel Schwarz <schwarz emanuel gmail com>]

Hi,
to write back formattings to a file, i need GtkTextIters at the bounding 
positions of all set GtkTextTags from the GtkTextBuffer.
I checked the sources and it seems that i could get the info from the 
GtkTextBTree.
Is there a way to get it from the API?


Thanks Emanuel