Hi Eric,

I thought the original post was pretty complete!!

I would strongly support this proposal. In practice we have almost
wholly abandoned using anything other than ITEM_TREE as the top-level
archetype structures, for all the reasons suggested by Sam. Tables are
useful but generally within the body of the archetype,rather than as
the top-level structure. A good example is neural reflexes, for which
a table structure is appropriate but which would be better expressed
within a CLUSTER archetype, rather than ENTRY, to cope with variations
in Examination recording practice.

We are also finding that the use of embedded archetypes based on
ITEM-TREE is a little cumbersome. There is considerable value in
having child archetypes which can be re-used in different parent ENTRY
archetypes e.g. Medication details or Specimen details, but using
CLUSTER gives us much more flexibility.

Some kind of simplification around the use of CLUSTER, with the
ability to define TABLES within a CLUSTER or ITEM_TREE would give us
some simpler modelling constructs and, as you suggest, flatten the
data path.

Ian
Dr Ian McNicoll
office / fax? +44(0)1536 414994
mobile +44 (0)775 209 7859
skype ianmcnicoll
ian.mcnicoll at oceaninformatics.com


Clinical analyst,?Ocean Informatics
openEHR Clinical Knowledge Editor www.openehr.org/knowledge
Honorary Senior Research Associate, CHIME, UCL
BCS Primary Health Care SG Group wHi Eric,ww.phcsg.org




On 10 November 2010 05:12, Erik Sundvall <erik.sundvall at liu.se> wrote:
> Oops, I intended to push the save-button, not the send-button on that last
> message. Now we'll just have to make a fire, shovel some snow, milk our
> goats, say good morning to cat and chickens, fix a leaking car tire, get
> kids to school and myself and my wife to work before I can continue writing.
> Sorry about spamming the list.
>
> // Erik
>
> On Wed, Nov 10, 2010 at 05:56, Erik Sundvall <erik.sundvall at liu.se> wrote:
>>
>> I hope you don't mind breaking out a side thread with a concrete
>> harmonisation suggestion...
>
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