#requires -version 2.0
[CmdletBinding()]
param(
    [parameter(Mandatory=$true)]
    [ValidateScript({ $_ | Test-Path -PathType Leaf })]
    [string]
    $Path
)

function New-XmlNamespaceManager ($XmlDocument, $DefaultNamespacePrefix) {
    $NsMgr = New-Object -TypeName System.Xml.XmlNamespaceManager -ArgumentList $XmlDocument.NameTable
    $DefaultNamespace = $XmlDocument.DocumentElement.GetAttribute('xmlns')
    if ($DefaultNamespace -and $DefaultNamespacePrefix) {
        $NsMgr.AddNamespace($DefaultNamespacePrefix, $DefaultNamespace)
    }
    $XmlDocument.DocumentElement.Attributes | 
        Where-Object { $_.Prefix -eq 'xmlns' } |
        ForEach-Object {
            $NsMgr.AddNamespace($_.LocalName, $_.Value)
        }
    return ,$NsMgr # unary comma wraps $NsMgr so it isn't unrolled
}

$ErrorActionPreference = 'Stop'
Set-StrictMode -Version Latest

$x = [xml](Get-Content -Path $Path)
$nsmgr = New-XmlNamespaceManager -XmlDocument $x

'http://schemas.microsoft.com/netfx/2009/xaml/activities/presentation',
'clr-namespace:System.Activities.Debugger;assembly=System.Activities' |
    ForEach-Object {
        $Namespace = $_
        $prefix = $nsmgr.LookupPrefix($namespace)
        if ($prefix) {
            $x.SelectNodes("//$($prefix):*", $nsmgr) | 
                ForEach-Object {
                    $_.ParentNode.RemoveChild($_) | Out-Null
                }
            $x.SelectNodes("//@*[namespace-uri()='$namespace']") | 
                ForEach-Object {
                    $_.OwnerElement.RemoveAttributeNode($_) | Out-Null
                }
        }
    }
$x.Save($Path + '.clean')