-A URI reference to Keep uses the @keep:@ scheme followed by the portable data hash, collection size, and path to the file inside the collection. For example, @keep:2463fa9efeb75e099685528b3b9071e0+438/19.fasta.bwt@.
+A URI reference to Keep uses the @keep:@ scheme followed by either the portable data hash or UUID of the collection and then the location of the file inside the collection. For example, @keep:2463fa9efeb75e099685528b3b9071e0+438/19.fasta.bwt@ or @keep:zzzzz-4zz18-zzzzzzzzzzzzzzz/19.fasta.bwt@.