"Macro Value in the Operator Name"

Hi,

Please run the below process file.

<operator name="Root" class="Process" expanded="yes">
    <operator name="IteratingOperatorChain" class="IteratingOperatorChain" expanded="yes">
        <parameter key="iterations"	value="3"/>
        <operator name="ExampleSetGenerator" class="ExampleSetGenerator">
            <parameter key="target_function"	value="simple polynomial classification"/>
        </operator>
        <operator name="JMySVMLearner" class="JMySVMLearner">
            <parameter key="keep_example_set"	value="true"/>
        </operator>
        <operator name="ModelApplier" class="ModelApplier">
            <list key="application_parameters">
            </list>
        </operator>
        <operator name="Perform_%{a}" class="ClassificationPerformance">
            <parameter key="main_criterion"	value="accuracy"/>
            <list key="class_weights">
            </list>
        </operator>
        <operator name="IOStorer" class="IOStorer">
            <parameter key="name"	value="g_%{a}"/>
            <parameter key="io_object"	value="PerformanceVector"/>
        </operator>
    </operator>
    <operator name="IORetriever (2)" class="IORetriever">
        <parameter key="name"	value="g_1"/>
        <parameter key="io_object"	value="PerformanceVector"/>
    </operator>
    <operator name="IORetriever (3)" class="IORetriever">
        <parameter key="name"	value="g_2"/>
        <parameter key="io_object"	value="PerformanceVector"/>
    </operator>
    <operator name="IORetriever (4)" class="IORetriever">
        <parameter key="name"	value="g_3"/>
        <parameter key="io_object"	value="PerformanceVector"/>
    </operator>
</operator>

One can see three performance vectors after running the above process file. Three being three separate performance vectors for three separate iterations (dummy data created).

I want to name each performance vector as say Perform_1, Perform_2, and Perform_3. How do I do this? I tried by changing the operator name as 'Perform_%{a}', but in vain as you can see it from the name of the outputs generated as 'Performance Vector (Perform_%{a})' for all the three performance vectors. Are there any ways of this?

Thanks,
Shubha.