On 15/04/2013 11:54, Thomas Beale wrote:
>
> the update logic is Composition-level, and you can't commit something 
> smaller than a Composition. The default logic is 'optimistic' meaning 
> that there is no locking per se; instead, each request for a 
> Composition includes the version (in meta-data not visible to the data 
> author), and an attempt to write back a new version of a Composition 
> will cause a check between the current top version and the 'current 
> version' recorded for the Composition when it was retrieved. IF they 
> are identical, the write will succeed. There is also branching 
> supported in the specification. Read the Common IM 
> <http://www.openehr.org/releases/1.0.2/architecture/rm/common_im.pdf> 
> for the details.

I had meant to say here: this makes sense for EHR and similar systems 
because there is very low / no write competition for the same piece of 
the same patient record, as a general rule.

- thomas

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