I have to say that it is my impression nearly all activity IHTSDO talks 
about seems to be centred on either the international release aka 'the 
core' or the national release centres. I have not heard a single 
presentation or discussion talking about any details of 
lower-than-national level extensions, although there are examples in the 
meta-data map (from Nehta). But I was not trying to imply that this was 
policy in any way, only that I suspect that the thinking has not yet 
engaged with local and other kinds of extensions. I am certainly very 
happy if I am wrong, and everyone (but me) already knows how this should 
work...

- thomas

On 06/05/2010 16:50, Mikael Nystr?m wrote:
>
> Hi Thomas,
>
> As another member of IHTSDO Technical Committee I would like to ask 
> from where you have got your impression that RefSets should mainly be 
> maintained by the national release centers, because that is not at all 
> my impression. Some of the national release centers, like NHS in UK, 
> maintain Subsets/RefSets, but I have never heard anything about that 
> only the national release centers should create and maintain RefSets. 
> My impression is that whoever that find it useful to create and 
> maintain an own RefSet should be able to do it.
>
> The only requirement to create a RefSet is the technical requirement 
> to have an own namespace to create the RefSet into. However, all 
> organizations and persons with a valid SNOMED CT license can get an 
> own namespace.
>
> (I have my own namespace, so if I would I could immediately produce 
> and release as many RefSets that I want.)
>
>                              Greetings,
>
>                              Mikael
>
*
*
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