Format-Xml.ps1

<#
.SYNOPSIS
Pretty-print XML.

.INPUTS
System.Xml.XmlDocument to serialize.

.OUTPUTS
System.String containing the serialized XML document with desired indents.

.FUNCTIONALITY
XML

.EXAMPLE
Get-PSProvider alias |ConvertTo-Xml |Format-Xml.ps1

<Objects>
  <Object Type="System.Management.Automation.ProviderInfo">
    <Property Name="ImplementingType" Type="System.RuntimeType">Microsoft.PowerShell.Commands.AliasProvider</Property>
    <Property Name="HelpFile" Type="System.String">System.Management.Automation.dll-Help.xml</Property>
    <Property Name="Name" Type="System.String">Alias</Property>
    <Property Name="PSSnapIn" Type="System.Management.Automation.PSSnapInInfo">Microsoft.PowerShell.Core</Property>
    <Property Name="ModuleName" Type="System.String">Microsoft.PowerShell.Core</Property>
    <Property Name="Module" Type="System.Management.Automation.PSModuleInfo" />
    <Property Name="Description" Type="System.String"></Property>
    <Property Name="Capabilities" Type="System.Management.Automation.Provider.ProviderCapabilities">ShouldProcess</Property>
    <Property Name="Home" Type="System.String"></Property>
    <Property Name="Drives" Type="System.Collections.ObjectModel.Collection`1[System.Management.Automation.PSDriveInfo]">
      <Property Type="System.Management.Automation.PSDriveInfo">Alias</Property>
    </Property>
  </Object>
</Objects>

.EXAMPLE
Get-PSProvider alias |ConvertTo-Xml |Format-Xml.ps1 -NewLineOnAttributes

<Objects>
  <Object
    Type="System.Management.Automation.ProviderInfo">
    <Property
      Name="ImplementingType"
      Type="System.RuntimeType">Microsoft.PowerShell.Commands.AliasProvider</Property>
    <Property
      Name="HelpFile"
      Type="System.String">System.Management.Automation.dll-Help.xml</Property>
    <Property
      Name="Name"
      Type="System.String">Alias</Property>
    <Property
      Name="PSSnapIn"
      Type="System.Management.Automation.PSSnapInInfo">Microsoft.PowerShell.Core</Property>
    <Property
      Name="ModuleName"
      Type="System.String">Microsoft.PowerShell.Core</Property>
    <Property
      Name="Module"
      Type="System.Management.Automation.PSModuleInfo" />
    <Property
      Name="Description"
      Type="System.String"></Property>
    <Property
      Name="Capabilities"
      Type="System.Management.Automation.Provider.ProviderCapabilities">ShouldProcess</Property>
    <Property
      Name="Home"
      Type="System.String"></Property>
    <Property
      Name="Drives"
      Type="System.Collections.ObjectModel.Collection`1[System.Management.Automation.PSDriveInfo]">
      <Property
        Type="System.Management.Automation.PSDriveInfo">Alias</Property>
    </Property>
  </Object>
</Objects>
#>

#Requires -Version 7
[CmdletBinding()][OutputType([string])] Param(
# The XML string or document to format.
[Parameter(Position=0,Mandatory=$true,ValueFromPipeline=$true)][xml] $Xml,
# A whitespace indent character to use, space by default.
[ValidatePattern('\A\s\z',ErrorMessage='A whitespace character is required')]
[char] $IndentChar = ' ',
<#
The number of IndentChars to use per level of indent, 2 by default.
Set to zero for no indentation.
#>
[int] $Indentation = 2,
# Indicates attributes should be written on a new line.
[Alias('SplitAttributes','AttributesSeparated')][switch] $NewLineOnAttributes
)
Process
{
	[Xml.XmlWriterSettings] $cfg = New-Object Xml.XmlWriterSettings -Property @{
		Indent              = !!$Indentation
		IndentChars         = "$IndentChar" * $Indentation
		OmitXmlDeclaration  = $true
		NewLineOnAttributes = $NewLineOnAttributes
	}
	$sw = New-Object IO.StringWriter
	[Xml.XmlWriter] $xw = [Xml.XmlWriter]::Create($sw, $cfg)
	$Xml.WriteTo($xw)
	$xw.Dispose()
	$sw.ToString()
	$sw.Dispose()
}