<operator name="Global" class="Process">
  <parameter key="logfile"      value="advanced2.log"/>
 
  <operator name="Input" class="ExampleSource">
    <parameter key="attributes" value="data/polynomial.aml"/>
  </operator>

  <operator name="BackwardElimination" class="FeatureSelection">
    <parameter key="selection_direction" value="backward"/>

    <operator name="XVal" class="XValidation">
      <parameter key="number_of_validations" value="5"/>

      <operator name="Learner" class="LibSVMLearner">
        <parameter key="kernel_type" value="poly"/>
        <parameter key="C"           value="1000.0"/>
        <parameter key="svm_type"    value="epsilon-SVR"/>
      </operator>
      <operator name="ApplierChain" class="OperatorChain">
        <operator name="Applier" class="ModelApplier"/>
        <operator name="Evaluator" class="PerformanceEvaluator">
          <parameter key="squared_error" value="true"/>
        </operator>
      </operator>
    </operator>
  </operator> 

  <operator name="AttributeWeightsWriter" class="AttributeWeightsWriter">
        <parameter key="attribute_weights_file"	value="selected_attributes.wgt"/>
    </operator>
  <operator name="Learner" class="LibSVMLearner">
    <parameter key="kernel_type" value="poly"/>
    <parameter key="C"           value="1000.0"/>
    <parameter key="svm_type"    value="epsilon-SVR"/>
    <parameter key="model_file" value="model.mod"/>
  </operator>
  <operator name="ModelOutput" class="ModelWriter">
    <parameter key="model_file" value="model.mod"/>
  </operator>
</operator> 
