1.  Removed the definition of the mark-1.0 and signedMark-1.0 and
       replaced with reference to draft-lozano-smd, that contains the
       definition for the mark, signed marked, and encoded signed mark.
   2.  Split the <launch:timestamp> into <launch:generatedDate> and
       <launch:acceptedDate> based on feedback from Trung Tran.
   3. Changed the the mark date elements to dateTime elements in the samples directory.