Thank Tom,
Somehow the text gave me the impression that use of archetype Node Id was
optional, which is clearly not the case.
Kind regards
Seref
On Tue, Aug 14, 2012 at 5:37 PM, Thomas Beale <
thomas.beale at oceaninformatics.com> wrote:
> On 14/08/2012 10:34, Seref Arikan wrote:
>
> Greetings,
> According to adl 1.5 document on the openEHR web site (issued 25 Jan
> 2012), Section 5.3.6.3, the runtime paths for single valued attributes can
> omit node identifer.
> The example given in the document uses miles per hour and km per hour
> alternatives. The thing is, if the runtime path is what is going to be
> persisted (and I can't see any other practical cases), the persisted data
> will have no information to mark the semantics of the selection of an
> option among alternatives.
>
>
> actually, this text is a bit misleading. If we have the archetype
>
> ELEMENT[at0004] matches { -- speed limit
> value matches {
> QUANTITY[at0022] matches { -- miles per hour
> magnitude matches {|0..55|}
> property matches {"velocity"}
> units matches {"mph"}
> }
> QUANTITY[at0023] matches { -- km per hour
> magnitude matches {|0..100|}
> property matches {"velocity"}
> units matches {"km/h"}
> }
> }
> }
>
> then the data instance created from the at0022 form of the QUANTITY will
> be (in dADL):
>
> items = <
> ["1"] = < --
> ELEMENT
> archetype_node_id = <"at0004">
> value = < --
> QUANTITY
> archetype_node_id = <"at0022">
> magnitude = <25>
> >
> >
> ["2"] = <....>
> etc
> >
>
> so the path items[at0004]/value[at0022] will choose the quantity,
> although items[at0004]/value would do just as well. (Remember, the Xpath
> equivalents are items[@archetype_node_id='at0004']/value
> [@archetype_node_id='at0022'] etc - the [at0022] is just a shorthand
> selection predicate.)
>
> The paths are not 'persisted' as such - just the data. The paths are
> always derivates of the data.
>
>
>
> In case of a query such as get me all Xs where value is expressed as km
> per hour, the system can not know what which option was used: kmph or mph,
> because there is not node identifier.
>
>
> in this case, use the path items[at0004]/value[at0022].
> *
> * - thomas
>
>
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