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

**Category:** [Technical (archive)](https://discourse.openehr.org/c/technical-archive/156)
**Created:** 2010-04-13 13:35 UTC
**Views:** 1
**Replies:** 2
**URL:** https://discourse.openehr.org/t/how-to-express-multiple-composers-for-a-composition-with-an-history-of-events/14977

---

## Post #1 by @Leonardo_Moretti

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/), 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

---

## Post #2 by @thomas.beale

You can specify different participants in OBSERVATION.other_participations (inherited from ENTRY).

- thomas beale

[details="(attachments)"]

![OceanInformaticsl.JPG|183x82](upload://2lcnRHcC3QqDv6AeaDZuo8M9Qlv.jpeg)

[/details]

---

## Post #3 by @system

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

---


**Canonical:** https://discourse.openehr.org/t/how-to-express-multiple-composers-for-a-composition-with-an-history-of-events/14977
**Original content:** https://discourse.openehr.org/t/how-to-express-multiple-composers-for-a-composition-with-an-history-of-events/14977