Specifies the revision identifier of a data object.
Parent Elements: MetInf Restrictions: The value MUST specify either an
UTC based date/time stamp or a monotonically increasing numeric integer
string. If a date/time stamp, then the text MUST be in the complete
representation, basic format defined by [ISO8601]. Determination of the
ordinal sequence of the version of an existing object in the recipient
and the version of the object can be made by comparing the content
information of the object with the value on the existing object. In case
a Meta element containing a Version element contains meta-information
about a Data object, this Meta element MUST have the same parent as the
Data object it refers to. If not present, then the object doesn't
currently have a revision version identifier. When the element type is
missing, this SHOULD NOT be interpreted as meaning the original version
of the data object.