dataschemas/dataschema(varyingName1)/attributes:

      attr 1
      attr 2
      
dataschemas/dataschema(varyingName2)/attributes:

    attr 1
    attr 3
    
<dataschemas>
  <dataschema name="varyingName1">
    <attributes>
      <attribute>
      attr 1
      attr 2
      Extra attribute added</attribute>
    </attributes>
  </dataschema>
  <dataschema name="varyingName2">
   <attributes>
    <attribute>
    attr 1
    attr 3
    Extra attribute added</attribute>
   </attributes>
  </dataschema>
</dataschemas>