I've read a few pages of the Budé (1930) edition of Xenophon's Anabasis. I know in different countries Greek is printed with a slightly different typography. For example, French printing uses a different, medial beta for the middles of words, which I find pretty nice. Like this: βάρϐαροι. (I think it's less elegant with this font though).
But now in this book they print ὅ τι like this: ὅ,τι
That is, there seems to be a comma but no space between the words. It's not an error or a dead bug, since I've seen it at least 4 times.
Do you know anything about this? And on a more general note, do you know any good internet site about classical Greek typography? I did a little googling and found something, but nothing very interesting.