vtkImageSamplerSource.xml

<ServerManagerConfiguration>

  <ProxyGroup name="filters">

    <!-- ================================================================ -->
    <!-- SamplingGridFilter                                               -->
    <!-- Filter version of vtkSamplingGridGenerator                       -->
    <!-- ================================================================ -->
    <SourceProxy name="ImageGridSampler"
                 class="vtkImageSamplerSource"
                 label="Image Sampling Grid">

      <InputProperty
         name="Input"
         command="SetInputConnection">
        <ProxyGroupDomain name="groups">
          <Group name="sources"/>
          <Group name="filters"/>
        </ProxyGroupDomain>
        <DataTypeDomain name="input_type">
          <DataType value="vtkDataSet"/>
        </DataTypeDomain>
        <InputArrayDomain name="input_array" optional="1"/>
      </InputProperty>

      <DoubleVectorProperty
         name="Spacing"
         command="SetSpacing"
         number_of_elements="3"
         animateable="1"
         default_values="0.0 0.0 0.0" >
        <Documentation>
          When the spacing along an axis is Zero, the Resolution will be used to compute the spacing.
          If the spacing is non zero, it will override the Resolution setting.
          Note that when Resolution is used, the points will exactly fit in the box, when spacing is used, there may be small gaps at the edges.
        </Documentation>
      </DoubleVectorProperty>

      <IntVectorProperty
         name="Resolution"
         command="SetResolution"
         number_of_elements="3"
         animateable="1"
         default_values="32 32 32" >
        <Documentation>
          When the spacing along an axis is Zero, the Resolution will be used to compute the spacing.
          If the spacing is non zero, it will override the Resolution setting.
          Note that when Resolution is used, the points will exactly fit in the box, when spacing is used, there may be small gaps at the edges.
        </Documentation>
      </IntVectorProperty>

      <DoubleVectorProperty
         name="Delta"
         command="SetDelta"
         number_of_elements="1"
         animateable="1"
         default_values="0.0005" >
        <Documentation>
          Add some increment to each axis when defining the box
        </Documentation>
      </DoubleVectorProperty>

    </SourceProxy>

  </ProxyGroup>

</ServerManagerConfiguration>