From the Debian (and Ubuntu) Policy Manual:
5.6.19. `Binary' ----------------
This field is a list of binary packages. Its syntax and meaning varies depending on the control file in which it appears.
When it appears in the `.dsc' file, it lists binary packages which a source package can produce, separated by commas[1]. It may span multiple lines.
From the Debian (and Ubuntu) Policy Manual:
5.6.19. `Binary'
----------------
This field is a list of binary packages. Its syntax and meaning
varies depending on the control file in which it appears.
When it appears in the `.dsc' file, it lists binary packages which a
source package can produce, separated by commas[1]. It may span
multiple lines.