These generic functions return version information for classes
VersionsNull-class for unversioned objects. The
version information is an object of
classVersion has the following behaviors:
Versions-class object obtained from the object.
Consults the definition of
class and return the current version information, if available.
VersionsNull-class object to indicate no version information available.
By default, the
classVersion<- method has the following behavior:
classVersion(Versioned-instance)["id"] <- value
Assign (update or add)
value is coerced to a valid version description. see
Versions-class for additional access methods.
Object whose version is to be determined, as described above.
classVersion returns an instance of
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