dynamically parse the attributes of an XML element..

SAMPLE.XML

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<Document Date="2013-09-06T11:55:29.151-04:00">
    <Asset applicationName="Sample" id="301">
        <componentsSecurity="true" EnterpriseUtil="true" StateManagement="true" smtp="true"/>
    </Asset>
</Document>

MY PROBLEM

I'm having trouble trying to dynamically parse the "components" element - because any given Asset may have different components (attributes) listed, I would like to loop through the element and call a function with the attribute name and the value as the 2 parameters. The script below is as close as I can get...now I'm stuck.....please help!

MY SCRIPT

$xml = [xml](Get-Content "C:\sample.xml")

$NodeList = $xml.selectnodes("/Document/Asset/components/@*")
foreach ($AttributeValue in $NodeList) {
    #This displays the "value" of the attribute (ie: true)
    $AttributeValue

    #This displays the "name" of the attribute (ie: Security, EnterpriseUtil, etc...)
    $AttributeValue.ToString()
   
    #As soon as I try to do something simple like a write-host the "$AttributeValue" comes out blank
    Write-Host "-" $AttributeValue.ToString() "-" $AttributeValue "-"
    #Eventually I will call a function with the 2 parmeters "name" & "value"
}