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A metadata version defines the types of study events, forms, item groups, and items that form the study data.
The Include element references a prior metadata version. This causes all the definitions in that prior metadata version to be automatically included in this one. Any of the included definitions can be replaced (overridden) by explicitly giving a new version of the definition (with the same OID) in the new metadata version. See Include for more information on how the Include element works. New definitions (with new OIDs) can be added in the same way.
Note: The current metadata model does not include any scheduling information such as the time ordering of events, the spacing of events, conditional occurrence of events, and so on. The analogous information for forms is also not included.