CLUSTER also needs a Null_flavour


If a Element can be null, seems reasonable to allow that to a Cluster for the exact same reasons (e.g. there could be reasons to not being able to get a series of measurements and then an empty Cluster with a reason would be created)
We can also discuss if it should go to ITEM or ITEM_STRUCTURE (or leave it until we redo the ITEM_STRUCTURE classes)
I remember hearing that CIMI has also gone this way, but probably Thomas knows better.




Pablo Pazos
June 5, 2015, 10:41 PM

Hi Diego, the assertion about the ability to identify the person event if each element is empty assumes a lot, like: needs access to the demographic database, knowledge about how it is implemented / structured, a little knowledge about openEHR RM maybe, etc. I still don't think that's a good reason to add null_flavour to CLUSTER (or ITEM), but if others see value on this, is ok with me.

Sebastian Iancu
September 26, 2019, 11:39 PM

Reading all the comments above I understand that:
1.) we will not do this
2.) related things are done (or in progress) in Release 1.1.0
I will add here also Release 1.1.0, and next SEC will do further handling of this issue.

Diego Bosca
September 27, 2019, 8:24 AM

I don’t exactly remember which was the original discussion prior to raising this issue, so I’m fine with 1)

Ian McNicoll
September 27, 2019, 9:27 AM

I agree with (1) - ‘non-persuasive’ as our friends say

Sebastian Garde
September 27, 2019, 10:14 AM

I’d agree that the use case for this doesn’t seem to be sufficient considering the increased complexity and likely confusion.


Diego Bosca




Affects versions