# Demographic Archetypes

**Category:** [Technical (archive)](https://discourse.openehr.org/c/technical-archive/156)
**Created:** 2009-10-20 21:21 UTC
**Views:** 2
**Replies:** 3
**URL:** https://discourse.openehr.org/t/demographic-archetypes/14937

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## Post #1 by @Oxford_Partnership

I am struggling to understand why CLUSTER archetypes can exists within the DEMOGRAPHICS area, yet the CLUSTER class does not seem to exists within the Demographics IM.
If CLUSTER is allowed does that mean ELEMENT is also allowed ?

many thanks
OP

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## Post #2 by @Anthony_Hall

Q

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## Post #3 by @Lisa_Thurston1

The Demographic IM explicitly assumes the existence of the Data Structures IM (which is reusable outside the health domain and contains CLUSTER and ELEMENT), so the answer is yes.

Oxford Partnership wrote:

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## Post #4 by @system

Hi,

There is a demographic model cluster class \- it is in CKM as well \- the
last item in the tree\.
If someone comes up with an demographic model Element archetype, we
would need to add demographic model element classes to CKM\.

Sebastian

Oxford Partnership wrote:

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**Canonical:** https://discourse.openehr.org/t/demographic-archetypes/14937
**Original content:** https://discourse.openehr.org/t/demographic-archetypes/14937