[xsl] Sorting help

I need help sorting XML file. This is the XSLT I am using. I am trying to sort 
the PIPTransaction based on Usage tag, UsagePurpose.  UsagePurpose="Cancel" 
transaction should be at the starting of the file and than rest of the 
transaction. Thanks In advance.

<?xml version="1.0"?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"; version="1.0" 
xmlns:pd="http://www.oeb.gov.on.ca"; exclude-result-prefixes="pd">
<xsl:template name="Usage">
            <xsl:apply-templates mode="copynode"/>
</xsl:template>
<xsl:template match="@*" mode="copynode">
            <xsl:copy>
                        <xsl:apply-templates select="@*" mode="copynode"/>
                        <xsl:apply-templates mode="copynode"/>  
            <xsl:for-each select="pd:Usage">
            <xsl:sort select="@UsagePurpose" order="descending" 
data-type="text"/>
                        </xsl:for-each>
            </xsl:copy>
</xsl:template>
<xsl:template match="*" mode="copynode">
            <!--xsl:element name="{local-name()}" namespace=""-->
            <xsl:element name="{local-name()}">
                        <xsl:apply-templates select="@*" mode="copynode"/>
                        <xsl:apply-templates mode="copynode"/>  
            </xsl:element>
</xsl:template>
</xsl:stylesheet>

XML file

<?xml version="1.0" encoding="UTF-8"?>
<PIPEDocument CreationDate="20070125070128125ES" 
DocumentReferenceNumber="doc000006759814" Version="3.1"  
xsi:schemaLocation="http://www.oeb.gov.on.ca PIPEDocument.xsd" 
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance";  
xmlns="http://www.oeb.gov.on.ca";>
            <PIPTransaction TransactionReferenceNumber="000006759814">
                        <Usage BillRequired="Yes" UsagePurpose="Original">
                                    <ConsumerInformation>
                                                <FullName>o Ltd. 
Partnership</FullName>
                                    </ConsumerInformation>
                                    </Usage>
            </PIPTransaction>
            <PIPTransaction TransactionReferenceNumber="000006759750">
                        <Usage BillRequired="Yes" UsagePurpose="Original">
                                    <ConsumerInformation>
                                                <FullName>997095</FullName>
                                    </ConsumerInformation>
                                    </Usage>
            </PIPTransaction>
            <PIPTransaction TransactionReferenceNumber="000006759835">
                        <Usage BillRequired="Yes" UsagePurpose="Original">
                                    <ConsumerInformation>
                                                <FullName>o Ltd. 
Partnership</FullName>
                                    </ConsumerInformation>
                                    </Usage>
            </PIPTransaction>
            <PIPTransaction TransactionReferenceNumber="000006759845">
                        <Usage BillRequired="Yes" UsagePurpose="Original">
                                    <ConsumerInformation>
                                                <FullName>o Ltd. 
Partnership</FullName>
                                    </ConsumerInformation>
                                    </Usage>
            </PIPTransaction>
            <PIPTransaction TransactionReferenceNumber="000006759857">
                        <Usage BillRequired="Yes" UsagePurpose="Original">
                                    <ConsumerInformation>
                                                <FullName>997095</FullName>
                                    </ConsumerInformation>
                                    </Usage>
            </PIPTransaction>
            <PIPTransaction TransactionReferenceNumber="000006759999">
                        <Usage BillRequired="Yes" UsagePurpose="Original">
                                    <ConsumerInformation>
                                                <FullName>o Ltd. 
Partnership</FullName>
                                    </ConsumerInformation>
                                    </Usage>
            </PIPTransaction>
            <PIPTransaction TransactionReferenceNumber="000006760024">
                        <Usage BillRequired="Yes" UsagePurpose="Original">
                                    <ConsumerInformation>
                                                <FullName>o Ltd. 
Partnership</FullName>
                                    </ConsumerInformation>
                                    </Usage>
            </PIPTransaction>
            <PIPTransaction TransactionReferenceNumber="000006760061">
                        <Usage BillRequired="Yes" UsagePurpose="Original">
                                    <ConsumerInformation>
                                                <FullName>o Ltd. 
Partnership</FullName>
                                    </ConsumerInformation>
                                    </Usage>
            </PIPTransaction>
            <PIPTransaction TransactionReferenceNumber="000006760064">
                        <Usage BillRequired="Yes" UsagePurpose="Original">
                                    <ConsumerInformation>
                                                <FullName>o Ltd. 
Partnership</FullName>
                                    </ConsumerInformation>
                                    </Usage>
            </PIPTransaction>
            <PIPTransaction TransactionReferenceNumber="000006760166">
                        <Usage BillRequired="Yes" UsagePurpose="Original">
                                    <ConsumerInformation>
                                                <FullName>o Ltd. 
Partnership</FullName>
                                    </ConsumerInformation>
                                    </Usage>
            </PIPTransaction>
            <PIPTransaction TransactionReferenceNumber="000006760186">
                        <Usage BillRequired="Yes" UsagePurpose="Original">
                                    <ConsumerInformation>
                                                <FullName>o Ltd. 
Partnership</FullName>
                                    </ConsumerInformation>
                                    </Usage>
            </PIPTransaction>
            <PIPTransaction TransactionReferenceNumber="000006760869">
                        <InvoiceSettlementTotal BillPurpose="Original">
                                    <MarketParticipantInformation>
                                                <CompanyName>ties 
Ltd</CompanyName>
                                                
<GSTRegistrationNumber>820586</GSTRegistrationNumber>
                                                <MarketParticipantAccountNumber 
 ParticipantType="Distributor">02293594</MarketParticipantAccountNumber>
                                    </MarketParticipantInformation>
                                    </InvoiceSettlementTotal>
            </PIPTransaction>
            <PIPTransaction TransactionReferenceNumber="000006760673">
                        <InvoiceSettlementDetail BillPurpose="Original" 
TransactionCrossReferenceNumber="000006760869">
                                    <MarketParticipantInformation>
                                                <CompanyName>ties 
Ltd</CompanyName>
                                                
<GSTRegistrationNumber>867120586</GSTRegistrationNumber>
                                                <MarketParticipantAccountNumber 
 ParticipantType="Distributor">0293594</MarketParticipantAccountNumber>
                                    </MarketParticipantInformation>
                                    </InvoiceSettlementDetail>
            </PIPTransaction>
            <PIPTransaction TransactionReferenceNumber="000006756662">
                        <NSLSDaily UnitOfMeasure="kWh" Date="20070109">
                                    <Zone>
                                                <NSLSEntry>
                                                            
<Consumption>149444</Consumption>
                                                            <Price>3.06</Price>
                                                </NSLSEntry>
                                    </Zone>
                        </NSLSDaily>
            </PIPTransaction>
            <PIPTransaction TransactionReferenceNumber="000006759538">
                        <ApplicationAdviceAccept 
OriginalTransactionReferenceNumber="70230000700980" 
PIPTransactionType="InvoiceBillReady">
                                    <ConsumerInformation>
                                                <FullName>Store 26805</FullName>
                                    </ConsumerInformation>
                                    <AccountInformation>
                                                <ConsumerAccountNumber 
ParticipantType="Distributor">5717204267001720</ConsumerAccountNumber>
                                    </AccountInformation>
                        </ApplicationAdviceAccept>
            </PIPTransaction>
            <PIPTransaction TransactionReferenceNumber="000006759632">
                        <DropRequest>
                                    <DropInformation>
                                                <Reason>Nonpayment By 
Customer</Reason>
                                    </DropInformation>
                                    </DropRequest>
            </PIPTransaction>
            <PIPTransaction TransactionReferenceNumber="000006759640">
                        <Usage 
OriginalTransactionReferenceNumber="000006121188" BillRequired="Yes" 
UsagePurpose="Cancel">
                                    <ConsumerInformation>
                                                <FullName>o Ltd. 
Partnership</FullName>
                                    </ConsumerInformation>
                        </Usage>
            </PIPTransaction>
            <PIPTransaction TransactionReferenceNumber="00000659646">
                        <Usage OriginalTransactionReferenceNumber="00000698902" 
BillRequired="Yes" UsagePurpose="Cancel">
                                    <ConsumerInformation>
                                                <FullName>o Ltd. 
Partnership</FullName>
                                    </ConsumerInformation>
                        </Usage>
            </PIPTransaction>
            <PIPTransaction TransactionReferenceNumber="000006759642">
                        <Usage 
OriginalTransactionReferenceNumber="000006238274" BillRequired="Yes" 
UsagePurpose="Cancel">
                                    <ConsumerInformation>
                                                <FullName>o Ltd. 
Partnership</FullName>
                                    </ConsumerInformation>
                        </Usage>
            </PIPTransaction>
            <PIPTransaction TransactionReferenceNumber="000006759643">
                        <Usage 
OriginalTransactionReferenceNumber="000006359096" BillRequired="Yes" 
UsagePurpose="Cancel">
                                    <ConsumerInformation>
                                                <FullName>o Ltd. 
Partnership</FullName>
                                    </ConsumerInformation>
                        </Usage>
            </PIPTransaction>
            <PIPTransaction TransactionReferenceNumber="000006759651">
                        <Usage 
OriginalTransactionReferenceNumber="000006358797" BillRequired="Yes" 
UsagePurpose="Cancel">
                                    <ConsumerInformation>
                                                <FullName>o Ltd. 
Partnership</FullName>
                                    </ConsumerInformation>
                        </Usage>
            </PIPTransaction>
            <PIPTransaction TransactionReferenceNumber="000006759660">
                        <Usage 
OriginalTransactionReferenceNumber="000006626224" BillRequired="Yes" 
UsagePurpose="Cancel">
                                    <ConsumerInformation>
                                                <FullName>o Ltd. 
Partnership</FullName>
                                    </ConsumerInformation>
                        </Usage>
            </PIPTransaction>
            <PIPTransaction TransactionReferenceNumber="000006759653">
                        <Usage 
OriginalTransactionReferenceNumber="000006237816" BillRequired="Yes" 
UsagePurpose="Cancel">
                                    <ConsumerInformation>
                                                <FullName>o Ltd. 
Partnership</FullName>
                                    </ConsumerInformation>
                        </Usage>
            </PIPTransaction>
            <PIPTransaction TransactionReferenceNumber="000006759662">
                        <Usage 
OriginalTransactionReferenceNumber="000006121616" BillRequired="Yes" 
UsagePurpose="Cancel">
                                    <ConsumerInformation>
                                                <FullName>o Ltd. 
Partnership</FullName>
                                    </ConsumerInformation>
                                    </Usage>
            </PIPTransaction>
</PIPEDocu

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