How to filter data from a source XML? Please help!

Hi Experts,
   I have a source XML as shown below:
    <Inventory>
     <InventoryItem>
       <ItemCode>InTransit</ItemCode>
       <Quantity>1000</Quantity>
     </InventoryItem>
     <InventoryItem>
       <ItemCode>Available</ItemCode>
       <Quantity>1500</Quantity>
     </InventoryItem>
     <InventoryItem>
       <ItemCode>Restricted</ItemCode>
       <Quantity>2500</Quantity>
     </InventoryItem>
    </Inventory>
My Target XML is as below
    <Inventory>
      <stock>1500</stock>
    </Inventory>
The stock element contains Quantity value where ItemCode is 'Available'.
But note that there are 3 InventoryItem nodes.
So how to get the desired target XML in XI mapping? Basically I have to filter data from source XML based on value of an element. What is the best approach to handle this?
Kindly help
Thanks
Gopal

Hi venkat,
          Your solution does'nt work fine. But why are you using collapsecontext and splitbyvalue before putting the value into stock element?
           Kindly explain your concept.
My target message is:
<?xml version="1.0" encoding="UTF-8"?>
<Inventory>
   <InventoryItem>
      <ItemCode>InTransit</ItemCode>
      <Quantity>1500</Quantity>
   </InventoryItem>
   <InventoryItem>
      <ItemCode>Available</ItemCode>
      <Quantity>1000</Quantity>
   </InventoryItem>
   <InventoryItem>
      <ItemCode>UnRestricted</ItemCode>
      <Quantity>2000</Quantity>
   </InventoryItem>
   <InventoryItem>
      <ItemCode>Available</ItemCode>
      <Quantity>2500</Quantity>
   </InventoryItem>
</Inventory>
I am getting the output even though stock is unbounded and I have used collapsecontext and splitbyvalue as:
<InvStock>
<Stock>1000</Stock>
</InvStock>
I should get:
<InvStock>
<Stock>1000</Stock>
<Stock>2500</Stock>
</InvStock>
Thanks
Gopal
Message was edited by:
        gopalkrishna baliga

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Message was edited by:
        gopalkrishna baliga
Message was edited by:
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Message was edited by:
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Message was edited by:
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Message was edited by:
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