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

joachim wackerow, 2004-02-06
-->
<survey_collection domain="time">
  <!-- attribute "domain" could have the values "time, "region", etc. -->
  <survey URI="MZ1996.xml">MZ1996</survey>
  <!-- ID of survey -->
  <survey URI="MZ1998.xml">MZ1998</survey>
  <!--
  ...
  -->
  <!--
  Integration of the existing DDI structure to describe the collection of surveys.
  -->
  <codeBook level="survey_collection">
    <!-- NEW attribute "level", default is "study" -->
    <stdyDscr>
      <citation>
        <titlStmt>
          <titl>German Microcensus</titl>
          <IDNo agency="ZUMA">MZ1990-1999</IDNo>
        </titlStmt>
      </citation>
      <!--
      Description of the survey collection of Microcensus.
      This is information, which is common to all surveys of the collection.
      -->
      <stdyInfo>
        <abstract>The microcensus is the official representative statistics of the population and the labour market ...</abstract>
        <!--
        ...
        -->
      </stdyInfo>
    </stdyDscr>
    <dataDscr>
      <!--
      The existing element "varGrp" with a variable list in the attribute "var"
      seems not appropriate for this use.
      -->
      <NEW_varGrp name="AGE">
        <labl>Age group</labl>
        <NEW_variable_identifier survey_id="MZ1996" name="V10"/>
        <NEW_variable_identifier survey_id="MZ1998" name="V12"/>
      </NEW_varGrp>
      <!--
      Variables, which are common to every survey of the collection
      -->
      <var name="V22">
        <labl>Sex</labl>
        <catgry>
          <catValu>1</catValu>
          <labl>male</labl>
        </catgry>
        <catgry>
          <catValu>2</catValu>
          <labl>female</labl>
        </catgry>
      </var>
      <!--
      ...
      -->
    </dataDscr>
  </codeBook>
</survey_collection>
