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. 2013 May 9;13:57. doi: 10.1186/1472-6947-13-57

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Copyright © 2013 Sundvall et al.; licensee BioMed Central Ltd.

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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EHR versioning. Example EHR changes to VERSIONED_OBJECTs over time, committed and logged as contributions at four separate time points (the time axis goes downwards). COMPOSITIONs, FOLDER, EHR_ACCESS, and EHR_STATUS are all versioned using the same mechanism. Compositions can be flagged as being of type ‘event’ (blue above) intended for one-time recordings, or flagged as ‘persistent’ (green above) intended for long time continuously updated use. Abbreviated example identifiers are illustrated under the shapes. The figure was inspired by Figure8in the openEHR architecture overview document[5].