As a concrete example, consider the clusters of reprints detected by the Viral Texts project (https://viraltexts.org) within a large set of OCR'd nineteenth-century newspapers. We would like users browsing a newpaper page on the Library of Congress' Chronicling America website (https://chroniclingamerica.loc.gov/) or the German newspaper portal to be alerted to the fact that some articles on that page were reprinted, e.g., 20, 100, or 1000s of times. Clicking on those annotations would take the user to list of other versions of that text from various sources. One could also assemble groups of passages as "collection" objects in IIIF. Besides using these clusters or composite documents to display reprints from the Viral Texts project, we could generalize this idea to display groups of related reports on the same event for the Virality of Racial Terror project, groups of mentions of the same entity, groups of related images, etc. Other projects could aggregate passages the correspond to the same (addressable part of) the same work. For instance, scholars tracking serial fiction could group all instances of the same chapter of a novel. Scholars of manuscript transmission could trace exerpts copied into composite manuscripts alongside other texts. This sort of sub-volume metadata is often left out of catalogue records.