[DDI-CDG] Classification scheme / formal logic of derived variables

[Joachim Wackerow]

Hello,

Thinking of a list of topics which have to be included in DDI 3, I would 
like to mention two issues, which were not much discussed up to now.

1. Classification schemes to describe social science 
variables/classifications
2. Means to describe the formal logic of constructed variables.
See attached document.

For the discussion in Edinburgh with other people I think Reto’s diagram 
(2005-03-21) of cross-national and diachronic datasets is a good 
starting point, perhaps we should have some A3 printouts (sorry, we have 
no such printer at ZUMA).

I would like to mention a recent discussion on the SRG, which could be 
of interest for this group, see the four emails "Comparative Data 
Direction", starting at:
http://www.icpsr.umich.edu/pipermail/ddi-srg/2005-May/000774.html

Sorry, probably I will have no time at next Tuesday's conference call. 
I'm looking forward to the discussion in Edinburgh.

Achim



Below are some references/background links to the subjects in the 
attached document.

CLASET (weak model)
http://www.unece.org/stats/documents/2004/02/metis/wp.26.e.pdf

Neuchatel Terminology (complex model)
http://www.unece.org/stats/documents/2000/11/metis/10.e.pdf

An analysis of the commonalities between the comparative data problem 
and the complex data problem, from I-Lin Kuo
http://www.icpsr.umich.edu/pipermail/ddi-srg/2004-December/000599.html

MathML
http://www.w3.org/TR/MathML2/

MathML example for "IF (V1 == 5) OR (V2 >=3 AND V3 == 2)"
http://www.icpsr.umich.edu/pipermail/ddi-users/2004-January/000151.html

MathML example included in a DDI 2.0 extension
http://www.icpsr.umich.edu/pipermail/ddi-cdg/2004-February/000008.html

Rule Markup Initiative
http://www.ruleml.org/

Common Logic, general
http://philebus.tamu.edu/cl/

XML Common Logic (XCL)
http://www.altheim.com/specs/xcl/1.0/index.html
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