[DDI-CDG] Proposal of a structure for collections of surveys

[Joachim Wackerow]

To complete the technical proof of concept find attached files for a 
'quick and dirty' example CDG DDI DTD with MathMl included for the DDI 
element catgry.

DDI-MathML.dtd - DDI DTD version 2.0 including MathMl for catgry
DDI-MathML_diff.txt - Difference file to original DTD
Tables.dtd - original Tables DTD, necessary for DDI DTD
single_study_mathml_ddi_dtd.xml - example codebook markup with a 
constructed variable, to validate with DDI-MathMl.dtd

With this mechanism it should be possible to use a foreign DTD/Schema 
like MathMl for:

- To document skip patterns
- Construction of new variables
- Modifying existing variables to adjust categories for comparison with 
other studies.

Again it was usefull for myself to see the working example.

Kind regards, Achim
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