Once you clean up the quoting problem in that XML file you can deal with it like this:
$xml = [xml](get-content c:\junk\xml.xml)
Having namespaces in the XML makes navigating slightly more difficult, but let's say you wanted to get the entire "row":
$row = $xml.xml.data.row
If you want to pull out individual attributes of a row:
$xml.xml.data.row.ows_Created
# Or, using the $row variable from the previous example
$row.ows_Created