transform XML using XSLT

transform.ps1

<#
.SYNOPSIS
    Transform an xml file
.DESCRIPTION
    load a XML file and load a XSLT file, then transform the XML using the XSLT and output to the console
.PARAMETER $xsltfilename
    The path to the XSLT file
.PARAMETER $filename
    The path to the XML file to be transformed
.EXAMPLE
    C:\PS> 
    .\tranform.ps1 .\rgs_broke.xml .\fix_escalation.xslt > rgs_fixed.xml
.NOTES
    Author: Alex McCool
    Date:   Jan 17, 2017
#>

param(
[Parameter(Mandatory=$true)]
[string]$xsltfilename, 
[Parameter(Mandatory=$true)]
[string]$filename
)


function Load-Xml
{
param([string]$filename)

$content = Get-Content $filename

$stream = new-object System.IO.MemoryStream

$writer = new-object System.IO.StreamWriter($stream)
$writer.Write("$content")
$writer.Flush()
$stream.position = 0

$xml = new-object System.Xml.XmlTextReader($stream)

return $xml
}

function Load-Xslt
{
param([string]$filename)

$content = Get-Content $filename

$stream = new-object System.IO.MemoryStream
$writer = new-object System.IO.StreamWriter($stream)
$writer.Write("$content")
$writer.Flush()
$stream.position = 0

$reader = [System.Xml.XmlReader]::create($stream)
$xslt = New-Object System.Xml.Xsl.XslCompiledTransform
$xslt.Load($reader)

return $xslt
}


$xml = Load-Xml($filename)
$xslt = Load-Xslt($xsltfilename)

$output = New-Object System.IO.MemoryStream
$reader = new-object System.IO.StreamReader($output)


$arglist = new-object System.Xml.Xsl.XsltArgumentList
$xslt.Transform($xml, $arglist, $output)

$output.position = 0
$transformed = [string]$reader.ReadToEnd()
$reader.Close()

write-output $transformed