<?xml version="1.0" encoding="UTF-8"?>
<XCEDE xmlns="http://www.xcede.org/xcede-2" version="2.0">
  <project ID="A">
    <projectInfo>
      <subjectGroupList>
        <subjectGroup ID="X">
          <subjectID>1</subjectID>
          <subjectID>2</subjectID>
        </subjectGroup>
      </subjectGroupList>
    </projectInfo>
  </project>
  <project ID="B">
    <projectInfo>
      <subjectGroupList>
        <subjectGroup ID="Z">
          <subjectID>3</subjectID>
        </subjectGroup>
      </subjectGroupList>
    </projectInfo>
  </project>
  <subject ID="1" />
  <subject ID="2" />
  <subject ID="3" />
  <visit ID="1"
         projectID="A" subjectID="1" subjectGroupID="X" />
  <study ID="MR scan"
         projectID="A" subjectID="1" subjectGroupID="X" visitID="1" />
  <episode ID="task run 1"
         projectID="A" subjectID="1" subjectGroupID="X" visitID="1" studyID="MR" />
  <acquisition ID="MR image"
         projectID="A" subjectID="1" subjectGroupID="X" visitID="1" studyID="MR"
         episodeID="task run 1" />
  <acquisition ID="behavioral data"
         projectID="A" subjectID="1" subjectGroupID="X" visitID="1" studyID="MR"
         episodeID="task run 1" />
  <acquisition ID="heart rate"
         projectID="A" subjectID="1" subjectGroupID="X" visitID="1" studyID="MR"
         episodeID="task run 1" />
  <study ID="Clinical interview"
         projectID="A" subjectID="1" subjectGroupID="X" visitID="2" />
  <!-- ... etc. ... -->
</XCEDE>
