One of the goals of Folger Digital Texts is to create a sophisticated model of character interactions, including listing participants in each stage direction. Unfortunately, there appears to be no explicit way to add participant information into a <stage> element. We experimented with using @who in <move>, but ultimately decided that this misrepresented the nature of many character behaviours. After a lot of experimentation, we settled on doing including character participation info using @corresp, but it is clearly not ideal. @who added to <stage>, analogous to who it operates in <move>, would solve the problem.