HP 3000 Manuals

HP System Dictionary XL Gen. Ref. Vol. 1

Versions 

Some applications require multiple versions of dictionary occurrences.
System Dictionary provides a version feature that allows multiple
versions of the same entities and relationships to exist simultaneously
within a single domain.  A version in the dictionary is a name space
within a domain, and you can think of it of as a partition of the domain,
or as a copy of the entities and relationships in the domain.

MPE/iX 5.0 Documentation