A PowerShell script which removes all the unnecessary elements and attributes from a Team Build Process Template XAML file that have been added by the Workflow Designer. http://blog.stangroome.com/2014/02/12/effectively-comparing-team-build-process-templates/

Remove-IgnorableXaml.ps1

#requires -version 3
[CmdletBinding()]
param (
    [Parameter(Mandatory)]
    [ValidateScript({ $_ | Test-Path -PathType Leaf })]
    [string]
    $Path,

    [string]
    $Destination = $Path
)

# ensure the path is fully qualified for use with $Doc.Save()
$Destination = $PSCmdlet.GetUnresolvedProviderPathFromPSPath($Destination)

$Namespaces = @{
    xmlns = 'http://www.w3.org/2000/xmlns/'
    mc = 'http://schemas.openxmlformats.org/markup-compatibility/2006'
}

$Doc = (Select-Xml -Path $Path -XPath / ).Node

$IgnorableValue = $Doc.DocumentElement.GetAttribute('Ignorable', $Namespaces.mc)
$IgnorablePrefixes = @()
if ($IgnorableValue) {
    $IgnorablePrefixes = @($IgnorableValue -split '\s+')
}

foreach ($Prefix in $IgnorablePrefixes) {
    $NamespaceUri = $Doc.DocumentElement.GetAttribute($Prefix, $Namespaces.xmlns)
    $PrefixNamespaces = @{ $Prefix = $NamespaceUri }
    
    # elements
    Select-Xml -Xml $Doc -XPath "//$Prefix`:*" -Namespace $PrefixNamespaces |
        Select-Object -ExpandProperty Node |
        ForEach-Object {
            $_.ParentNode.RemoveChild($_) | Out-Null
        }

    # attributes
    Select-Xml -Xml $Doc -XPath "//*/@$Prefix`:*" -Namespace $PrefixNamespaces |
        Select-Object -ExpandProperty Node |
        ForEach-Object {
           $_.OwnerElement.RemoveAttributeNode($_) | Out-Null
        }

}

$Doc.Save($Destination)