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A VSN in PUB notation begins with the fixed string PUB (for public). It always consists of six characters, with the format PUBpxx.
PUB | fixed name part to distinguish between private volumes (3 characters “PUB”) = type identifier |
p | Catalog ID (catid), (1 character; A..Z, 0..9) |
xx | sequential number within a pubset/volume set, (2 characters; 00..31) = sequential number |
A maximum of 36 pubsets or volume sets, consisting of up to 32 volumes, can be addressed with the single-character catalog ID.
Examples: PUBA00, PUBA25, PUB502