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

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

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