Unique paths for slots problem if slots are filled with same archetype

Diego Boscá yampeku at gmail.com
Fri Oct 19 05:44:58 EDT 2018


While I believe we have reproduced this behavior in the OPT management to
be compatible with existing tooling, in our typical slot solving
methodology (non-template mode) the original archetype slot node_id ends in
the new object node_id. Information about which slot was solved in this
node ended in a new attribute in the term definitions (we called that
attribute 'DCM', but you get the idea). We modified the AOM model to have
references to both current archetype and solved archetype in order to avoid
node_id collisions in archetype definition time.


I think we have talked before about the need of splitting the
archetype_node_id attribute into node_id / archetype_id, which I think
would solve these problems. Another solution would be to include always the
node id in the node id, even if you are using it to store the archetype_id,
so paths would look like
[openEHR-EHR-INSTRUCTION.service_request.v1::at0000]/protocol[at0008]/items[openEHR-EHR-CLUSTER.service_request_information.v1::at0141]

Regards

El vie., 19 oct. 2018 a las 10:57, Sebastian Garde (<
sebastian.garde at oceaninformatics.com>) escribió:

> Hi all,
>
>
>
> We have encountered an interesting issue with how to construct unique
> paths for slots when there is more than one slot on the same level, and
> both slots are filled with the same archetype.
>
> In this case, the resulting paths for both seem to be the same in OPT and
> thus in the data. (The at/id code of the slot are not part of the path for
> a filled slot.)
>
> Likewise, you cannot apply an annotation to only one of them, because they
> share the same path.
>
>
>
> This seems to be a general problem, but let me explain it in more detail
> using a concrete example:
>
> The problem manifests itself for example when you start using the Service
> Request Archetype in CKM (
> https://ckm.openehr.org/ckm/#showArchetype_1013.1.614).
>
>
>
> In the archetype’s protocol (see screenshot below), there are various
> slots, most importantly let’s look at the *Requester* and the *Receiver*
> Slot.
>
> In a template (see 2nd screenshot), both slots can be filled with the
> same archetype, technically, and it also seems reasonable from a content
> point of view to use the same archetype for both slots.
>
>
>
> The problem is that this means that the paths are no longer unique – there
> is no way to differentiate between the Requester and Receiver information
> anymore as far as we can see in the OPT, and consequently in the data.
>
> Also, if annotations are used on a path like this, these annotations would
> automatically be applied to both Requester and Receiver.
>
>
>
> For example, the path for BOTH the Requester and Receiver, once filled
> with a service_request_information CLUSTER archetype is:
>
>
> [openEHR-EHR-INSTRUCTION.service_request.v1]/protocol[at0008]/items[openEHR-EHR-CLUSTER.service_request_information.v1]
>
>
>
> Is anybody already using this archetype (or a similar one) in their
> systems and is encountering this issue? Is anybody using workarounds for
> this?
>
> One way this issue could be avoided/dodged is if the archetype wraps these
> slots in additional clusters, so that the resulting path is unique even if
> the same archetype is used inside slots on the same level.
>
> It seems perfectly reasonable to me to construct archetypes the way this
> one has been constructed, but I am not sure if the implications are clear.
>
>
>
> Is this something the SEC needs to have a look at if this is something
> that needs to be addressed somehow…or are we simply missing something?
>
> Maybe at0141 for Requester / at0142 for Receiver need to be included in
> the path somehow (even if it is ugly)…
>
>
>
> Regards,
>
> Sebastian
>
>
>
>
>
>
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> openEHR-technical at lists.openehr.org
>
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>


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Diego Boscá Tomás / Senior developer
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yampeku at gmail.com

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