Is there a way to create a multiblock

GM All,
I am trying to have two blocks of data (mesh and solution) in a XML .vtu format as provided below. The Paraview executable says that a reader for this program cannot be founds and gives a list of readers. However none contain xml. Please help:

Information about the mesh : each block has 2 hexahedras. The 2 hexs share 4 nodes.
Thank you
Ravi

<?xml version="1.0"?> 10 0 0 11 0 0 11 1 0 10 1 0 10 0 1 11 0 1 11 1 1 10 1 1 14 0 0 14 1 0 14 0 1 14 1 1 0 1 2 3 4 5 6 7 1 8 9 2 5 10 11 6 8 16 12 12
    <DataSet index="1" name="Block1">
  <UnstructuredGrid>
    <Piece NumberOfPoints="12" NumberOfCells="2">
      <Points>
        <DataArray type="Float32" NumberOfComponents="3" format="ascii">
          10 0 10
          11 0 10
          11 1 10
          10 1 10
          10 0 11
          11 0 11
          11 1 11
          10 1 11
          14 0 10
          14 1 10
          14 0 11
          14 1 11
        </DataArray>
      </Points>
      <Cells>
        <DataArray type="Int32" Name="connectivity" format='ascii'>
          0 1 2 3 4 5 6 7 
          1 8 9 2 5 10 11 6 
        </DataArray>
        <DataArray type="Int32" Name="offsets" format="ascii">
          8 16
        </DataArray>
        <DataArray type="UInt8" Name="types" format="ascii">
          12 12
        </DataArray>
      </Cells>
    </Piece>
  </UnstructuredGrid>
</DataSet>

</MultiBlockDataSet>

Simplified to one block →

<?xml version="1.0"?> 10 0 0 11 0 0 11 1 0 10 1 0 10 0 1 11 0 1 11 1 1 10 1 1 14 0 0 14 1 0 14 0 1 14 1 1 0 1 2 3 4 5 6 7 1 8 9 2 5 10 11 6 8 16 12 12
</MultiBlockDataSet>