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Subject: New ebRS Section 8.2.4, ClassificationNodeQuery



Regrep,

At its teleconference on Sept 7, the "regrep-query" team decided to try to 
replace the Browse and Drill Down section of Registry Services (cf ebRS 
Section 8.1) with enhancements to the Filter Query mechanism (cf ebRS 
Section 8.2).

I volunteered to produce a revised Section 8.2.4, ClassificationNodeQuery, 
that accommodates all of the requirements of Browse and Drill Down Query. 
Like with the RegistryEntryQuery distributed earlier today, it assumes new 
methods in ebRIM on the ClassificationNode class for getPathDepth() and 
getPathElements(). The getPathDepth() method is particularly important 
because it allows queries that return only a portion of the subtree of 
nodes beneath a given node in the classification scheme hierarchy. The 
getPath() method, already included in ebRIM, but not yet fully specified, 
is also very important because it allows one to effectively do recursive 
queries on classification scheme hierarchies.

The proposed new text for ClassificationNodeQuery (ebRS Section 8.2.4) is 
attached. If any of the proposed new methods are not approved for ebRIM, 
then the query elements corresponding to those methods can be deleted from 
the proposal.

-- Len


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

RS_ClassificationNodeQuery.pdf



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