Common UML View of External and Internal Classifications

External Scheme and Query teams,

I had a long chat with Nikola Stojanovic this morning about better ways to 
represent both internal and external classification schemes so that 
Classification instances and any queries involving classifications would 
minimize the differences between referencing them.

Attached is a 3-page PDF document with my view of what we discussed. It 
assumes a URN identifier for each RegistryEntry so it isn't necessary to 
create a new schemeURN attribute for ClassificationScheme and so that it 
isn't necessary to overload the name attribute of Classification to 
reference a schemeURN. It also assumes XPATH syntax for querying a "path", 
but retains the notion that a path is really a collection of level/value 
pairs and that the "path" attribute is a shortcut to represent those pairs.

I propose a revision of FilterQuery synatx (i.e. the 
HasClassificationBranch element) to accommodate this joint view and give 
several examples of its use.

Comments welcome.

-- Len


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Len Gallagher                             
NIST                                      Work: 301-975-3251
Bldg 820  Room 562                        Home: 301-424-1928
Gaithersburg, MD 20899-8970 USA           Fax: 301-948-6213
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