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

[Joachim Wackerow]

In addition to the proposal of 2004-02-06 I made a 'quick and dirty' 
example CDG DDI DTD. It was usefull for myself to clarify some points. 
It is not necessary to use XML Schema, as I thought. I think the 
structural reform group is planning to use XML Schema anyway.

The example CDG DDI DTD is a super set of the DDI DTD V2.0. XInclude is 
included in two places. With this DTD it is possible to validate the 
attached example CDG DDI files. The XPointer expression is simple, if an 
ID attribute and the DTD is used.

The attached ZIP file includes the following files:

DDI-CDG.dtd - super set of DDI DTD version 2.0
DTD_diff.txt - Difference file to original DTD
Tables.dtd - original Tables DTD, necessary for DDI DTD
MZ1996_dtd.xml - individual codebook according DDI-CDG.dtd
collection_of_surveys_dtd.xml - collection of surveys, codebook 
description as a subset of individual codebooks, according DDI-CDG.dtd
collection_of_collections_dtd.xml - the same for collections of collections
example.xsl - example stylesheet to extract information on a variable 
from a individual codebook; the information is actually stored in the 
collection codebook.
example.bat - the command for the XSL transformer xsltproc 
(http://www.xmlsoft.org/)

Kind regards Achim
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