# ITEM_LIST implementation in JAVA_KERNEL

**Category:** [Implementers (archive)](https://discourse.openehr.org/c/implementers-archive/158)
**Created:** 2006-08-15 15:09 UTC
**Views:** 1
**Replies:** 3
**URL:** https://discourse.openehr.org/t/item-list-implementation-in-java-kernel/11995

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## Post #1 by @Rodrigo_Filgueira1

Hi there,

We've been building some RM objects and have found that the implementation of ITEM_LIST differs from the spec. In the SPEC ITEM_LIST is composed of ELEMENTs whereas in the implementation it is composed of CLUSTERs.

Some questions:

Why did you decide to implement it this way?
In order to provide more generality should ITEM_LISTs not be composed of abstract ITEMS?
Does this not impose that archetypes containing ITEM_LISTS will have to define clusters and then ELEMENTS?

thank you

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## Post #2 by @Rodrigo_Filgueira1

Hi there,

We've been building some RM objects and have found that the implementation of ITEM_LIST differs from the spec. In the SPEC ITEM_LIST is composed of ELEMENTs whereas in the implementation it is composed of CLUSTERs.

Some questions:

Why did you decide to implement it this way?
In order to provide more generality should ITEM_LISTs not be composed of abstract ITEMS?
Does this not impose that archetypes containing ITEM_LISTS will have to define clusters and then ELEMENTS?

thank you

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## Post #3 by @Sam

ITEM_LIST must only contain elements, Sam

Rodrigo Filgueira wrote:

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## Post #4 by @rong.chen

Rodrigo Filgueira wrote:
> Hi there,
>
> We've been building some RM objects and have found that the implementation of ITEM\_LIST differs from the spec\. In the SPEC

It's based on previous release of the specification and will be updated\.
Cheers,
Rong

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**Canonical:** https://discourse.openehr.org/t/item-list-implementation-in-java-kernel/11995
**Original content:** https://discourse.openehr.org/t/item-list-implementation-in-java-kernel/11995