sample_input.xml

<?xml version="1.0" encoding="UTF-8"?>
<b:dataThingMap xmlns:b="http://org.embl.ebi.escience/baclava/0.1alpha">
  <b:dataThing key="list2">
    <b:myGridDataDocument lsid="" syntactictype="l('text/plain')">
      <s:metadata xmlns:s="http://org.embl.ebi.escience/xscufl/0.1alpha">
        <s:mimeTypes>
          <s:mimeType>text/plain</s:mimeType>
        </s:mimeTypes>
      </s:metadata>
      <b:partialOrder lsid="" type="list">
        <b:relationList>
          <b:relation parent="0" child="1" />
          <b:relation parent="1" child="2" />
          <b:relation parent="2" child="3" />
        </b:relationList>
        <b:itemList>
          <b:dataElement lsid="" index="0">
            <b:dataElementData>YQ==</b:dataElementData>
          </b:dataElement>
          <b:dataElement lsid="" index="1">
            <b:dataElementData>dmVyeQ==</b:dataElementData>
          </b:dataElement>
          <b:dataElement lsid="" index="2">
            <b:dataElementData>bmljZQ==</b:dataElementData>
          </b:dataElement>
          <b:dataElement lsid="" index="3">
            <b:dataElementData>dGVzdA==</b:dataElementData>
          </b:dataElement>
        </b:itemList>
      </b:partialOrder>
    </b:myGridDataDocument>
  </b:dataThing>
  <b:dataThing key="list1">
    <b:myGridDataDocument lsid="" syntactictype="l('text/plain')">
      <s:metadata xmlns:s="http://org.embl.ebi.escience/xscufl/0.1alpha">
        <s:mimeTypes>
          <s:mimeType>text/plain</s:mimeType>
        </s:mimeTypes>
      </s:metadata>
      <b:partialOrder lsid="" type="list">
        <b:relationList>
          <b:relation parent="0" child="1" />
          <b:relation parent="1" child="2" />
          <b:relation parent="2" child="3" />
        </b:relationList>
        <b:itemList>
          <b:dataElement lsid="" index="0">
            <b:dataElementData>dGhpcw==</b:dataElementData>
          </b:dataElement>
          <b:dataElement lsid="" index="1">
            <b:dataElementData>aXM=</b:dataElementData>
          </b:dataElement>
          <b:dataElement lsid="" index="2">
            <b:dataElementData>YQ==</b:dataElementData>
          </b:dataElement>
          <b:dataElement lsid="" index="3">
            <b:dataElementData>dGVzdA==</b:dataElementData>
          </b:dataElement>
        </b:itemList>
      </b:partialOrder>
    </b:myGridDataDocument>
  </b:dataThing>
</b:dataThingMap>