You can also choose to check out a different version
than the one specified by the vcmodule. To check out a different version,
you need to pass in a string that has one of these keywords:
- selector
- versionid
- versiontag
- branchid
- branchtag
followed by a colon, followed by the appropriate specification of a selector,
versionid, versiontag, branchid, or branchtag. If branchid or branchtag
is used, it can optionally be followed by a colon and a qualifier (where
the qualifier is in the form allowed when specifying a vcfile connection).
You cannot lock a module during a checkout operation.