<?xml version="1.0" encoding="UTF-8"?>
<!--
Collection of collections
Proposal of a new description level for a survey collection
on top of DDI codebooks.

joachim wackerow, 2004-02-06
-->
<survey_collection domain="nation">
  <collection URI="collection_of_surveys.xml">MZ1990-1999</collection>
  <collection URI="collection_of_surveys2.xml">OtherCountry1990-1999</collection>
  <!--
  ...
  -->
  <!--
  Integration of the existing DDI structure to describe this collection.
  -->
  <codeBook level="collection_of_collections">
    <!-- NEW attribute "level", default is "study" -->
    <stdyDscr>
      <citation>
        <titlStmt>
          <titl>European Micro Data ...</titl>
          <IDNo>EU1990-1999</IDNo>
        </titlStmt>
      </citation>
      <!--
      Description of the collection of collections.
      This is information, which is common to all included collections.
      -->
      <stdyInfo>
        <abstract>This collection provides data for every analysis ...</abstract>
        <!--
        ...
        -->
      </stdyInfo>
    </stdyDscr>
    <dataDscr>
      <!--
      Group of variable groups
      -->
      <NEW_varGrp type="group">
        <labl>Age</labl>
        <NEW_variable_identifier collection_id="MZ1990-1999" name="AGE"/>
      </NEW_varGrp>
      <!--
      ...
      -->
      <!--
      Variables, which are common to all included collections.
      -->
      <var name="V100">
        <labl>Nation</labl>
        <!--
        ...
        -->
      </var>
      <!--
      ...
      -->
    </dataDscr>
  </codeBook>
</survey_collection>
