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Welcome to the Sabre Data Source Message Definition Record (MDR) database. Once you have selected the SDS MDR Database, you will be be tranported to an automated selection frames page.

Once you select the MDR you wish to view, the segments in that specific MDR will be displayed in the lower left hand frame, select the Segment you wish to view, and the specific elements related to that MDR and segment will be available to you.

Sabre Data Source also provides an easy to use comparison data base for SDS subsets. 

Give it a try