This schema characterizes one or more collection views of the
objects to be transferred by a Producer to an Archive.

This schema characterizes on one side the authorized content
of each SIP (Submission Information Package), on the other side the
order in which SIPs have to be delivered by the Producer to the Archive.

This schema characterizes the organization of data for transfer
as a package between parties by providing a number of potentially
useful attributes including, but not limited to, sequence,
hierarchy, checksums, and global information about the whole package.