I often play and set early music. Often the particular instrument or voice is not specified; it depends on who is available in the ensemble. It is an increasingly accepted practice in writing the range of each part to present an ‘ambitus’ at the beginning of its first stave.
The ambitus is shown as two black note-heads vertically aligned; with the lower one representing the lowest note in the part and the higher one representing the highest note.
I would assert that this would be a valid inclusion to 3.5 Elements as it is a part of the part writing and not just engraving.