When different speakers speak in the drama at the same time, at which the wording of their speeches is different, these "common speech acts" are enclosed by <spGrp>.
The simultaneity is often indicated by a bracketing between the speech acts concerned, which is encoded using the attribute value pair @rendition="#leftBraced | #rightBraced" in the <spGrp> element.
Encoding of Common Speech Acts with Bracketing
Tip: For the encoding of bracketings cf. chap. Bracketings.