How do I use PowerShell to Validate XML files against an XSD?

Question

As a part of my development I'd like to be able to validate an entire folder's worth of XML files against a single XSD file. A PowerShell function seems like a good candidate for this as I can then just pipe a list of files to it like so: dir *.xml | Validate-Xml -Schema .\MySchema.xsd

I've considered porting C# code from the Validating an Xml against Referenced XSD in C# question, but I don't know how to Add handlers in PowerShell.

Answer 1

The PowerShell Community Extensions has a Test-Xml cmdlet. The only downside is the extensions havn't been updated for awhile, but most do work on the lastest version of powershell (including Test-Xml). Just do a Get-Childitem's and pass the list to a foreach, calling Test-Xml on each.

Answer 2

I wrote a PowerShell function to do this:

Usage:

dir *.xml | Test-Xml -Schema ".\MySchemaFile.xsd" -Namespace "http://tempuri.org"

Code:

function Test-Xml {
param(
    $InputObject = $null,
    $Namespace = $null,
    $SchemaFile = $null
)

BEGIN {
    $failCount = 0
    $failureMessages = ""
    $fileName = ""
}

PROCESS {
    if ($InputObject -and $_) {
        throw 'ParameterBinderStrings\AmbiguousParameterSet'
        break
    } elseif ($InputObject) {
        $InputObject
    } elseif ($_) {
        $fileName = $_.FullName
        $readerSettings = New-Object -TypeName System.Xml.XmlReaderSettings
        $readerSettings.ValidationType = [System.Xml.ValidationType]::Schema
        $readerSettings.ValidationFlags = [System.Xml.Schema.XmlSchemaValidationFlags]::ProcessInlineSchema -bor
            [System.Xml.Schema.XmlSchemaValidationFlags]::ProcessSchemaLocation -bor 
            [System.Xml.Schema.XmlSchemaValidationFlags]::ReportValidationWarnings
        $readerSettings.Schemas.Add($Namespace, $SchemaFile) | Out-Null
        $readerSettings.add_ValidationEventHandler(
        {
            $failureMessages = $failureMessages + [System.Environment]::NewLine + $fileName + " - " + $_.Message
            $failCount = $failCount + 1
        });
        $reader = [System.Xml.XmlReader]::Create($_, $readerSettings)
        while ($reader.Read()) { }
        $reader.Close()
    } else {
        throw 'ParameterBinderStrings\InputObjectNotBound'
    }
}

END {
    $failureMessages
    "$failCount validation errors were found"
}
}

Answer 3

XML ValidatorBuddy includes a command line tool which reads a XML settings file for batch validation and writes a log file also in XML format with the results. An easy way to validate multiple XML files and to get a detailed report.