xml_test_str -> xml version="1.0" encoding="UTF-8"?>

xml_test_str2 -> Hello
SimpleXMLElement Object ( [title] => Forty What? [from] => Joe [to] => Jane [body] => I know that's the answer -- but what's the question? )
SimpleXMLElement Object ( [customer] => SimpleXMLElement Object ( [id] => 1 [token] => 1234 ) [artist] => none [genre] => P [date] => 1938-07-22 [label] => none )