[DDI-SRG] Bug 65 and relationship between LP-PDP-PI

[Pascal Heus]

Wendy and all:
this seems to make sense, have you by any chance reworked the schema and 
produced any example? Has the ProprietaryRecordLayout been 
discussed/updated as well?
thanks
*P

Wendy Thomas wrote:
> The following action notes refer to the solution to clarify the 
> relationships between the logicalproduct, physicaldataproduct, and 
> physicalinstance. Bug 65 provides some information on this and the goal of 
> the original discussion was to 1) understand why we referenced in the 
> directions we did originally, 2) clarify links and the complete chain, and 
> 3) bring this section closer in structure to the rest of the schemas. 
> Below is our solution.   wlt
>
>
> Action:
> .	Restructure PhysicalDataProduct (M) to contain a 
> PhysicalStructureScheme (M) of individual PhysicalStructure (V). These can 
> be of any type (ASCII fixed, Proprietary, Ncube etc etc.)
> .	Content of PhysicalStructure is same as current PDP without the 
> BaseRecordLayout
> .	PhysicalStructureScheme is followed by a LayoutScheme (M) listing 
> of BaseRecordLayout substitution items of any type each referencing one 
> PhysicalStructure and one PhysicalSegment within that PhysicalStructure 
> (see the reference structure in PI CR2)
> .	Each BaseRecordLayout has an identifiable ID
> .	PhysicalInstance must now reference a BaseRecordLayout 
> substitution item (such as a RecordLayout)
> .	Link path will go: PI . BaseRecordLayout . PhysicalSegment . 
> LogicalRecord
> .	DataItem reference to Variable or Ncube needs to be constrained to 
> reference only those variables or Ncubes within the LogicalRecord 
> specified by the PhysicalRecordSegment. Use this constrained referencing 
> technique all the way up the tree to ensure correct containership.
> .	Once up to LogicalRecord description the pointer is identifying 
> the contents of the LogicalRecord and these variables/Ncubes can come from 
> any logical product (need to allow for inclusion of variables from 
> multiple waves and key structures for linking between waves)
>
>
>
> 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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