Powershell Script to get Vendor of given MAC-Address via WebAPI

Get-MACVendor.ps1

<#
.SYNOPSIS
Function Get-MACVendor returns the vendor for a given MAC-Address.
.DESCRIPTION
This script uses the API of https://macvendors.co. With Invoke-WebRequest (hence Version 3.0 is needed) it generates an output as xml.
.PARAMETER MAC
This is the only but mandatory parameter. Please enter a valid MAC-Address.
It works both with colons or hyphens - you decide.
.EXAMPLE
Execute Get-MACVendor.ps1 directly from shell with dot sourcing
. .\Get-MACVendor.ps1
Get-MACVendor -MAC Value
.NOTES
Author: Oliver Jäkel | oj@jaekel-edv.de | @JaekelEDV
with special support of @St_Meissner - thanks!
#>
#requires -Version 3.0
Function Get-MACVendor {
  [CmdletBinding(SupportsShouldProcess=$True)]
  param (
    [Parameter(Mandatory=$true,Helpmessage='Enter a valid MAC-Address')]
    [string] $MAC
  )
  Try {
    if ($PSCmdlet.ShouldProcess($MAC))
    {

        [string]$url = 'https://macvendors.co/api/'           #The site provides an api... 
        $request     = Invoke-WebRequest -Uri "$url/$MAC/xml" #...and an output as xml - great!!!
        [xml]$vendor = $request.content                       #Converts data to xml; "vendor" (company) is in the 'content'-section
        if ($vendor.InnerXml.Contains('no result') -ne $True)
            {
            $vendor.DocumentElement
            }
            else 
            {
            Write-Output -InputObject "No vendor found for $mac"
            }
       }
    }
  Catch
    {
    Write-Output -InputObject $_.Exception.Message
    }
}