Every file checked into the CVS repository should have the $Id$ symbol inside a comment, near the top
of the file. The $Id$
token is expanded by CVS into a useful header, identifying the revision
of the file, date last changed, and name of last user to change the file.
For example, the $Id$ for this document is $Id: ContributorsGuide.xml 243818 2004-03-02 22:32:40Z hlship $
.