Help on StatisticsOP to calculate statistical values for polygons in a shape file

I am a newbie on SNAP
I am trying to use GPT batch processing to calculate average values for polygons defined in a shape file.
Average and Stdev is to be calculated over many products over time for regions.
Can anybody show any sample xml file on application of StatisticsOP module.
Thanks in advance

Dear Maheswa,
I have created an example call for the StatisticsOp here: A StatisticsOp graph . I hope this is of help to you. Let me know if you still encounter problems.