# How to express multiple composers for a composition with an history of events

**URL:** <https://discourse.openehr.org/t/how-to-express-multiple-composers-for-a-composition-with-an-history-of-events/14977>\
**Category:** Technical (archive)\
**Created:** [13 April 2010 13:35 UTC](https://discourse.openehr.org/t/how-to-express-multiple-composers-for-a-composition-with-an-history-of-events/14977 "2010-04-13T13:35:15Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Leonardo\_Moretti](https://discourse.openehr.org/letter_avatar_proxy/v4/letter/l/b38774/32.png) [@Leonardo\_Moretti](https://discourse.openehr.org/u/Leonardo_Moretti)\
**Post date:** [13 April 2010 13:35 UTC](https://discourse.openehr.org/t/how-to-express-multiple-composers-for-a-composition-with-an-history-of-events/14977/1 "2010-04-13T13:35:15Z")

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Hi everybody,

looking at Apgar score (openEHR-EHR-OBSERVATION.apgar.v1) and Barthel  
Index (openEHR-EHR-OBSERVATION.barthel.v1) archetypes in CKM  
([http://openehr.org/knowledge/](http://openehr.org/knowledge/)), I undestand we can have several "event"  
samples of this data within the same HISTORY structure. So the same  
Barthel Index composition could contain several samples taken during an  
inpatient encounter.  
But in this way, how can we indicate that different sample are be taken  
by different doctors/nurses, if we can specificy the composer just at  
composition level and not at event level?

Regards  
leo

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**Author:** ![thomas.beale](https://discourse.openehr.org/user_avatar/discourse.openehr.org/thomas.beale/32/35_2.png) [@thomas.beale](https://discourse.openehr.org/u/thomas.beale)\
**Post date:** [13 April 2010 15:12 UTC](https://discourse.openehr.org/t/how-to-express-multiple-composers-for-a-composition-with-an-history-of-events/14977/2 "2010-04-13T15:12:30Z")

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You can specify different participants in OBSERVATION.other\_participations (inherited from ENTRY).

- thomas beale

> **(attachments)**
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> ![OceanInformaticsl.JPG](https://discourse.openehr.org/images/transparent.png)

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**Author:** ![system](https://discourse.openehr.org/uploads/default/original/2X/f/f0a1dedb20c42747bddcafd6c7df9db5f34f003c.svg) [@system](https://discourse.openehr.org/u/system)\
**Post date:** [13 April 2010 22:48 UTC](https://discourse.openehr.org/t/how-to-express-multiple-composers-for-a-composition-with-an-history-of-events/14977/3 "2010-04-13T22:48:35Z")

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Hi Leonardo,

Two things. First, a composition does not relate to an encounter but rather  
a recording. So you could have a number of compositions for one encounter  
with the data entered by different people.

Second, each ENTRY has an information provider which can be used to  
reference the source.

Third, attestations can be made on any data signing the content. This is for  
non-repudiation but can be used purely for information.

To use the first two mechanisms you will have to have separate ENTRY  
instances. Only the third mechanism would allow the same entry to be used  
but different events to be signed by different staff.

Hope this is helpful.

Cheers, Sam