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Each ODM document has a FileOID attribute (see the ODM elementSection 3.2, ODM). The FileOID should uniquely identify the document.
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An ODM document's FileType must be either Snapshot or Transactional. A Snapshot document shows how to re-create the current state of the source database with respect to the included data, but does not show how it got to be in that state over time. A Transactional document shows, for each included entity, both the latest state of the source database, and (optionally) some prior states of that entity in the source database. The TransactionType attribute need not be present in a Snapshot document. When processing a Transactional document, the rules for ordering a set of transactions for a single data point are those described in the Section 2.12, Clinical Data Element Ordering Section.
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