<date xmlns="http://www.tei-c.org/ns/1.0" when="1829-09-11" calendar="#julian #gregorian"> <hi rendition="#sup">30 <choice> <abbr>Aug</abbr> <expan>August</expan> </choice> </hi> / <hi rendition="#sub">11 <choice> <abbr>Sept.</abbr> <expan>September</expan> </choice> </hi> </date> Freytag