[DDI-SRG] Discussion on BUG 114

[Wendy Thomas]

This approach should be taken for ncube_recordlayout, 
inline_ncube_recordlayout, and tabular_ncube_recordlayout

On Thu, 31 Jan 2008, Wendy Thomas wrote:

> To make this functional DataItem should be nested in NCubeInstance. With
> these two items as siblings, the advantage of a DefaultNCubeReference and
> DefaultMeasure is limited. While helpful for files containing single
> NCubes a large number of very large files contain multiple NCubes with
> their contents strung out in a single record. The need as expressed above
> is accurate, but the solution is only half-way there.
>
> Alternate suggestion is to
>
> RecordLayoutType
>    PhysicalRecordSegmentReference 1..1
>    NCubeInstance 1..n
>       ADD DefaultMeasureValue 1..n
>       DataItem 1..n
>         REMOVE NCubeInstanceReference  [*** see note below]
>         CHANGE MeasureValue to AlternateMeasureValue 0..n
>
>
>
> This means that a RecordLayout for NCubes would contain a reference to its
> PhysicalRecordSegment which provides the link back to the LogicalRecord
> description.
>
> Each NCube in the PhysicalRecordSegment is described as a unit,
> NCubeInstance.
> EAch NCube Instance would provide its MeasureValue (or MeasureValues in
> the case of data stored as an ordered array for each cell). The DataItems
> could override the MeasureValues (for example a cell with an alternate
> measure or perhaps containing an incomplete or misordered array)
>
> ***DataItem would not need to reference an alternate NCube as there would
> be no way to include a Cell that has no previously defined relationship to
> the NCube cells.
>
>
> Wendy L. Thomas                          Phone: +1 612.624.4389
> Data Access Core Director		 Fax:   +1 612.626.8375
> Minnesota Population Center              Email: wlt at pop.umn.edu
> University of Minnesota
> 50 Willey Hall
> 225 19th Avenue South
> Minneapolis, MN 55455
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> DDI-SRG at icpsr.umich.edu
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>

Wendy L. Thomas                          Phone: +1 612.624.4389
Data Access Core Director		 Fax:   +1 612.626.8375
Minnesota Population Center              Email: wlt at pop.umn.edu
University of Minnesota
50 Willey Hall
225 19th Avenue South
Minneapolis, MN 55455