For-each loop in OSB

Hi,
I have a senario where i have a varied length XMl is coming to me in response of a service callout, and I need to iterate over it to get the fieldvalue of a particular tag based on its fieldName(e.g FUNCTION_CODE) and assign to a tag of another xml for example
THE XML Coming as response of service callout is
<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<soapenv:Body>
<getDefaultValueResponse xmlns="http://data.transformation.nab.cz.fc.ofss.com">
<getDefaultValueReturn>
<fieldDefaultValue>F</fieldDefaultValue>
<fieldName>FUNCTION_CODE</fieldName>
</getDefaultValueReturn>
<getDefaultValueReturn>
<fieldDefaultValue xsi:nil="true"/>
<fieldName>PAYMENT_TRANSACTION_ID</fieldName>
</getDefaultValueReturn>
<getDefaultValueReturn>
<fieldDefaultValue xsi:nil="true"/>
<fieldName>CHANNEL_ID</fieldName>
</getDefaultValueReturn>
<getDefaultValueReturn>
<fieldDefaultValue>CR</fieldDefaultValue>
<fieldName>CREDIT_DEBIT_FLAG</fieldName>
</getDefaultValueReturn>
<getDefaultValueReturn>
<fieldDefaultValue xsi:nil="true"/>
<fieldName>BRAND</fieldName>
</getDefaultValueReturn>
<getDefaultValueReturn>
<fieldDefaultValue>001</fieldDefaultValue>
<fieldName>ACCOUNT_STATUS</fieldName>
</getDefaultValueReturn>
<getDefaultValueReturn>
<fieldDefaultValue>Mr</fieldDefaultValue>
<fieldName>NAME_TITLE</fieldName>
</getDefaultValueReturn>
<getDefaultValueReturn>
<fieldDefaultValue>Y</fieldDefaultValue>
<fieldName>MAIL_RETURN_INDICATOR</fieldName>
</getDefaultValueReturn>
<getDefaultValueReturn>
<fieldDefaultValue xsi:nil="true"/>
<fieldName>ENTITY</fieldName>
</getDefaultValueReturn>
<getDefaultValueReturn>
<fieldDefaultValue xsi:nil="true"/>
<fieldName>TRANSACTION_CURRENCY</fieldName>
</getDefaultValueReturn>
<getDefaultValueReturn>
<fieldDefaultValue xsi:nil="true"/>
<fieldName>VERSION</fieldName>
</getDefaultValueReturn>
<getDefaultValueReturn>
<fieldDefaultValue xsi:nil="true"/>
<fieldName>TRANSACTION_RATE</fieldName>
</getDefaultValueReturn>
</getDefaultValueResponse>
</soapenv:Body>
</soapenv:Envelope>
and i want to assign that value to transactionType tag of
<?xml version="1.0" encoding="UTF-8"?>
<tns:sandstonetns xmlns:tns="http://sandstone.response.transactionHistory.app.nab.cz.fc.ofss.com" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://sandstone.response.transactionHistory.app.nab.cz.fc.ofss.com Sandstone_Data_Transaction_History_Response.xsd ">
<tns:listOfTransactions>
<tns:transactions>
<tns:clients>
<tns:clientID>tns:clientID</tns:clientID>
</tns:clients>
<tns:timestamp>2001-12-31T12:00:00</tns:timestamp>
<tns:sequenceNumber>tns:sequenceNumber</tns:sequenceNumber>
<tns:description>tns:description</tns:description>
<tns:amount>0</tns:amount>
<tns:accountNumber>tns:accountNumber</tns:accountNumber>
<tns:debitOrCreditFlag>tns:debitOrCreditFlag</tns:debitOrCreditFlag>
<tns:*transactionType*>tns:transactionType</tns:transactionType>
</tns:transactions>
</tns:listOfTransactions>
<tns:returnResponse>
<tns:returnCode>0</tns:returnCode>
<tns:returnDescription>tns:returnDescription</tns:returnDescription>
</tns:returnResponse>
</tns:sandstonetns>
I want to achieve this using for-each loop...kindly help me as I dont have any idea about how to use for-each loop...

i want to select a the tag fieldValue based on the data in tag fieldName for eg if i iterate over the whole response XML searching for fieldName=FUNCTION_CODE then I whuold get the value 'F' and then I would assign this value 'F' to the transactionType tag of the XML
<?xml version="1.0" encoding="UTF-8"?>
<tns:sandstonetns xmlns:tns="http://sandstone.response.transactionHistory.app.nab.cz.fc.ofss.com" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://sandstone.response.transactionHistory.app.nab.cz.fc.ofss.com Sandstone_Data_Transaction_History_Response.xsd ">
<tns:listOfTransactions>
<tns:transactions>
<tns:clients>
<tns:clientID>tns:clientID</tns:clientID>
</tns:clients>
<tns:timestamp>2001-12-31T12:00:00</tns:timestamp>
<tns:sequenceNumber>tns:sequenceNumber</tns:sequenceNumber>
<tns:description>tns:description</tns:description>
<tns:amount>0</tns:amount>
<tns:accountNumber>tns:accountNumber</tns:accountNumber>
<tns:debitOrCreditFlag>tns:debitOrCreditFlag</tns:debitOrCreditFlag>
*<tns:transactionType>tns:transactionType</tns:transactionType>*
</tns:transactions>
</tns:listOfTransactions>
<tns:returnResponse>
<tns:returnCode>0</tns:returnCode>
<tns:returnDescription>tns:returnDescription</tns:returnDescription>
</tns:returnResponse>
</tns:sandstonetns>

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