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4.2.4.3.10 Timespan Modification Statements

All of the previous statements affected data elements in all
timespans.  MSI extends functionality by allowing certain
modifications to be made that only affect specific timespans.

The various ways MSI allows the sort sequence and data
element retention modification for individual timespans are
described in the following sections:

   1 - Timespan Selection
   2 - Sequence Specification
   3 - Timespan Sequence Modification (AFTERSEQUENCE)
   4 - User Sequence Modification (APPENDSEQUENCE)
   5 - Data Element Retention