[xsl] Filtering source XML with XSL

Hi All,

I have got the below source XML. I need to copy the source XML to the
output tree based on a parameter. The parameter will be the value of the
field ExternalRefId. So basically the contents of the specific <Trade>
</Trade> matching its ExternalRefId should be selected to the output.

Can someone please advise how can I write a XSL for performing the
above?


<?xml version="1.0" encoding="UTF-8" standalone="yes"?>

<Trades>
  <Trade Type="DefaultSwap">
    <Header>
      <OriginatingSystem>XXX</OriginatingSystem>
      <ExternalRefId>SPZ3027V2</ExternalRefId>
      <ActionType>New</ActionType>
      <SentOn>20071022 10:25</SentOn>
      <Workflow>YES</Workflow>
      <SenderId>xxxxx</SenderId>
    </Header>
    <ReferenceObligation>
      <SecurityCurrency>XXX</SecurityCurrency>
      <Ticker>XXX</Ticker>
      <CusipOrIS>XXX</CusipOrIS>
      <SecurityId>XXDD</SecurityId>
      <SecurityDesc>DDDDD</SecurityDesc>
      <Issuer>ITV PLC</Issuer>
      <OriginalFace>325000000.0</OriginalFace>
      <RateType>FIXED</RateType>
      <Coupon>5.375</Coupon>
      <SecurityMaturity>20151019</SecurityMaturity>
      <SecurityPurpose>BOOKING ONLY</SecurityPurpose>
      <IssueDate>20051019</IssueDate>
      <FirstCouponDate>20061019</FirstCouponDate>
      <LastCouponDate>20141019</LastCouponDate>
      <IssuerCountry>GB</IssuerCountry>
      <ReferenceEntityId>GKDHCEAC8</ReferenceEntityId>
    </ReferenceObligation>
    <BookingInfo>
      <Books>
        <Book>
          <BookName>NODCCDS</BookName>
          <BookingSystem>CDS</BookingSystem>
          <BookingDesk>44446</BookingDesk>
        </Book>
      </Books>
      <FlowFlag>Easy</FlowFlag>
      <LegRole>All</LegRole>
    </BookingInfo>
  </Trade>
  <Trade Type="DefaultSwap">
    <Header>
      <OriginatingSystem>YYY</OriginatingSystem>
      <ExternalRefId>SPZ3027U4</ExternalRefId>
      <ActionType>New</ActionType>
      <SentOn>20071022 10:25</SentOn>
      <Workflow>YES</Workflow>
      <SenderId>xxx</SenderId>
    </Header>
    <ReferenceObligation>
      <SecurityCurrency>GBP</SecurityCurrency>
      <Ticker>ITV</Ticker>
      <CusipOrISIN>RED</CusipOrISIN>
      <SecurityId>XS0232037233</SecurityId>
      <SecurityDesc>ITVLN 5 3/8 10/19/15</SecurityDesc>
      <Issuer>ITV PLC</Issuer>
      <OriginalFace>325000000.0</OriginalFace>
      <RateType>FIXED</RateType>
      <Coupon>5.375</Coupon>
      <SecurityMaturity>20151019</SecurityMaturity>
      <SecurityPurpose>BOOKING ONLY</SecurityPurpose>
      <IssueDate>20051019</IssueDate>
      <FirstCouponDate>20061019</FirstCouponDate>
      <LastCouponDate>20141019</LastCouponDate>
      <IssuerCountry>GB</IssuerCountry>
      <ReferenceEntityId>GKDHCEAC8</ReferenceEntityId>
    </ReferenceObligation>
    <PaymentBusinessCenters>
      <PaymentBusinessCenter1>London</PaymentBusinessCenter1>
      <PaymentBusinessCenter2>New York</PaymentBusinessCenter2>
    </PaymentBusinessCenters>
  </Trade>
</Trades>

Regards,
Lalit
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