LINQ to XML can be used to validate an XML document against a schema file.

The XML document ISE-help.xml is validated against its schema in the following example:

using namespace System.Xml.Linq 
 
$path = Resolve-Path "$pshomemodulesISEen-US*-help.xml" 
$xDocument = [XDocument]::Load($path, [LoadOptions]::SetLineInfo) 
 
$xmlSchemaSet = [System.Xml.Schema.XmlSchemaSet]::new() 
$null = $xmlSchemaSet.Add( 
    'http://schemas.microsoft.com/maml/2004/10', 
    "$pshomeSchemasPSMamlmaml.xsd" 
) 
[System.Xml.Schema.Extensions]::Validate( 
    $xDocument, 
    $xmlSchemaSet, 
    { 
param($sender, $eventArgs) 
 
if ($eventArgs.Severity -in 'Error', 'Warning') { 
            Write-Host $eventArgs.Message 
            Write-Host ('  At {0} column {1}' -f 
                $sender.LineNumber, 
                $sender.LinePosition 
            ) 
        } 
    } 
) 

Positional information is made available by loading the XDocument with the SetLineInfo option.