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Every version in a repository has a version name, which is unique within that version's project. A version name consists of a major version name and a minor version name, separated by a period. The major version name may be any valid label. The minor version name is always a positive integer numeral, without leading 0's. The -r option specifies versions within a project by a version specifier.
A version specifier has a form similar to that of a version name: M.N, where M is a major version name and N is a minor version name. Certain values for M and N have special meanings:
@
means “the latest in the repository (or 0 if none).”
When @
is used for
the major version, it indicates the numerically largest major version
name (of the given project) among all those major version names that are
non-negative integers with no leading zeroes.