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Related to data element: data structure
A structured item characterised by stem and response options, with a history of usage that can be standardised for research purposes across clinical studies conducted by and for NIH.
(1) For XML, an item of data provided in a mark-up mode to allow machine processing. The mark up or tagging facilitates document indexing, search and retrieval, and provides standard conventions for insertion of codes.
(2) The smallest unit of information in a transaction.