source: valtobtest/subversion-1.6.2/packages/windows-WiX/BuildSubversion/Setup.wxs @ 3

<?xml version="1.0"?>
<!--
        Subversion Installer

        Author: Troy Simpson (troy@ebswift.com) http://www.ebswift.com
        Thanks to: Gábor DEÁK JAHN, Tramontána, Alex Shevchuk, the SharpDevelop team and of course, the WiX team

        Instructions for upgrades:

        1. Change ProductVersion
        2. Change RevisionNumber
        3. Change ProductCode
        4. Set the product version against the output name in the wixproj
           (go to project properties in SharpDevelop, or change it directly in the wixproj)
-->
<Wix xmlns="http://schemas.microsoft.com/wix/2006/wi">
        <?define RTMProductVersion="1.0.0" ?>
        <?define ProductVersion="1.5.1" ?> <!-- change for upgrade -->
        <?define RevisionNumber="r32289" ?> <!-- change for upgrade -->
        <?define ProductCode="{0ED6E1BF-3604-45E9-A719-8DD3B5826706}" ?> <!-- change for upgrade -->
        <?define UpgradeCode="{032A49B2-32FB-4AE0-BAB0-6AB953CC94DA}" ?> <!-- leave this value -->
        <?define PackageCode="*" ?>

        <Product Id="$(var.ProductCode)"
                Name="!(loc.ProductName)"
                Language="1033"
                UpgradeCode="$(var.UpgradeCode)"
                Manufacturer="CollabNet"
                Version="$(var.ProductVersion)">
                
                <Package Description="!(loc.PackageDescription)"
                    Id="$(var.PackageCode)"
                        Comments="!(loc.ProductName) $(var.ProductVersion)-$(var.RevisionNumber)"
                        InstallerVersion="200"
                    Keywords="!(loc.Keywords)"
                        Compressed="yes"/>

                <Upgrade Id="$(var.UpgradeCode)">
                        <UpgradeVersion Minimum="$(var.ProductVersion)"
                  IncludeMinimum="no"
                  OnlyDetect="yes"
                  Language="1033"
                  Property="NEWPRODUCTFOUND" />
                        <UpgradeVersion Minimum="$(var.RTMProductVersion)"
                  IncludeMinimum="yes"
                  Maximum="$(var.ProductVersion)"
                  IncludeMaximum="no"
                  Language="1033"
                      Property="UPGRADEFOUND" />
                </Upgrade>

                <!--
                        Source media for the installation. 
                        Specifies a single cab file to be embedded in the installer's .msi. 
                -->
                <Media Id="1" Cabinet="contents.cab" EmbedCab="yes" CompressionLevel="high"/>
                
                <!-- Installation directory and files are defined in Files.wxs -->
                <Directory Id="TARGETDIR" Name="SourceDir"/>
                
                <Feature Id="Complete"
                         Title="Subversion"
                         Description="Subversion for win32"
                         Level="1">

                                <?include ApacheFeature20x.wxi ?>
                                <?include ApacheFeature22x.wxi ?>
                                <?include iconvFeature20x.wxi ?>
                                <?include iconvFeature22x.wxi ?>
                                <?include CommonBinaryFeature.wxi ?>
                                <?include CommonSASLFeature.wxi ?>
                                <?include CommonShareFeature.wxi ?>

                                <?include LicensesCommonFeature.wxi ?>
                                <?include LicensesFeature20x.wxi ?>
                                <?include LicensesFeature22x.wxi ?>

                                <ComponentRef Id="svnbookchm"/>
                        
                        <!-- Program Files Folder -->
                                <ComponentRef Id='IDSubvProgGroup' />
                                <ComponentRef Id='IDSubvLicGroup' />
                </Feature>
                
                <Property Id="WIXUI_INSTALLDIR">INSTALLDIR</Property>
                
                <!-- note to self: properties populated from controls
                     must be in uppercase and have the secure option set -->
                <Property Id="APACHEVERSION" Secure="yes">Apache20</Property>

                <Property Id="ProductRevision">$(var.RevisionNumber)</Property>
                
                <!-- 
                        Use custom Subversion Fragment
                -->
                <UIRef Id="WixUI_Subversion"/>
                <WixVariable Id="WixUIDialogBmp" Value="dlgbmp.bmp"/>   
                <WixVariable Id="WixUIBannerBmp" Value="wiz-55x55x24.bmp"/>     

                <!-- Prevent downgrading -->
                <CustomAction Id="PreventDowngrading"
              Error="!(loc.NoDowngrade)" />
        
                <InstallExecuteSequence>
                  <Custom Action="PreventDowngrading"
                          After="FindRelatedProducts">NEWPRODUCTFOUND</Custom>
                  <RemoveExistingProducts After="InstallFinalize" />
                </InstallExecuteSequence>

                <InstallUISequence>
                  <Custom Action="PreventDowngrading"
                          After="FindRelatedProducts">NEWPRODUCTFOUND</Custom>
                </InstallUISequence>

                <!-- add/remove programs icon -->
                <Icon Id="Subversion.ico" SourceFile="..\..\..\SubversionTagSource\build\win32\svn.ico"/>
                <Property Id="ARPPRODUCTICON" Value="Subversion.ico" />

                <Property Id="ARPHELPLINK">http://subversion.tigris.org</Property>
        </Product>
</Wix>