# question about archetype

**Category:** [Implementers (archive)](https://discourse.openehr.org/c/implementers-archive/158)
**Created:** 2007-05-16 13:23 UTC
**Views:** 2
**Replies:** 4
**URL:** https://discourse.openehr.org/t/question-about-archetype/12413

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## Post #1 by @system

Please allow me a question, I don't know if an archetype on tne
openehrwebsite correct is and I would like to have a confirmation

I foudn structure below in the archetype: openEHR\-EHR\-EVALUATION\.goal\.v1

It has an ELEMENT, and an ELEMENT can only have one \(or none\) attribute:
value, accordig the lates version of document "Data structures"

The attribute "value" inside Element has to RM\-objects connected:
DV\_INTERVAL<COUNT> and DV\_INTERVAL<QUANTITY>
Both RM\-objects have a attribute lower, of a diffrent kind, but on the
same path: /data\[at0001\]/items\[at0005\]/items\[at0007\]/value/lower

Is this construction allowed, and if not, what is wrong with it

Thanks, Bert

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## Post #2 by @sebastian.garde

Bert,

If I understand correctly, that is the way a 'Choice' of different datatypes is modelled in archetypes:
In the goal archetype you can choose to use either DV\_INTERVAL<COUNT> or DV\_INTERVAL<QUANTITY> for the Target Measurement \(as the correct datatype depends on the target itself\)\. Lower/upper limits can consequently then be different too\.

I believe that this construction is allowed\.

Regards
Sebastian

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## Post #3 by @system

Sebastian Garde schreef:
> Bert,
>
> If I understand correctly, that is the way a 'Choice' of different datatypes is modelled in archetypes:
> In the goal archetype you can choose to use either DV\_INTERVAL<COUNT> or DV\_INTERVAL<QUANTITY> for the Target Measurement \(as the correct datatype depends on the target itself\)\. Lower/upper limits can consequently then be different too\.
>
> I believe that this construction is allowed\.
>  

Thank you very much, Sebastian, I didn't know that\. You helped me a lot\.
Sounds reasonable to me\. If you are wrong we will certainly find out,
because of others telling us\.

kind regards
Bert Verhees

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## Post #4 by @thomas.beale

Bert Verhees wrote:
> Sebastian Garde schreef:
>  
>> Bert,
>>
>> If I understand correctly, that is the way a 'Choice' of different datatypes is modelled in archetypes:
>> In the goal archetype you can choose to use either DV\_INTERVAL<COUNT> or DV\_INTERVAL<QUANTITY> for the Target Measurement \(as the correct datatype depends on the target itself\)\. Lower/upper limits can consequently then be different too\.
>>
>> I believe that this construction is allowed\.
>>  

It is \- it is a normal consequence of OO subtyping\.

\- thomas

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## Post #5 by @system

> Bert Verhees wrote:
>> Sebastian Garde schreef:
>>
>>> Bert,
>>>
>>> If I understand correctly, that is the way a 'Choice' of different
>>> datatypes is modelled in archetypes:
>>> In the goal archetype you can choose to use either DV\_INTERVAL<COUNT>
>>> or DV\_INTERVAL<QUANTITY> for the Target Measurement \(as the correct
>>> datatype depends on the target itself\)\. Lower/upper limits can
>>> consequently then be different too\.
>>>
>>> I believe that this construction is allowed\.
>>>
>
> It is \- it is a normal consequence of OO subtyping\.

I understand, I did not know how to read it\.
Bert

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**Canonical:** https://discourse.openehr.org/t/question-about-archetype/12413
**Original content:** https://discourse.openehr.org/t/question-about-archetype/12413