Two-level structure for cast > group

[lehkost]

Not such a pressing problem and so far only two occurrences in our data. This ticket is also meant to collect the phenomenon.

1. The play by Philipp Karl Bonafont, "Die Brunnengäste" (1816), has a 2-level group structure in the dramatis personae. The information has been encoded like this. The original cast can be seen here at Google Books. So we are losing the information "Brunnengäste in Aachen."
2. Conrad August Cossmann: "Der schöne Bund" (1826), encoded like this, and here at Google Books. Kürassiere (Leclaire, Selons) actually also belong to the group "im französischen Heere".
3. O.: "Die Geheimnißvolle, oder die Charade" (1819), encoded like this, and on p. 3 of this digitisation: double-structure of "Freundinnen" and "Schwestern".

Question is if we should enhance the data model to accept 2-level group information.