xmllint doesn't gripe about it: 

freebie:~ 677> cat foo.xml                                            
+  9:34:27
<?xml version="1.0" encoding="utf8" ?>
<testing>
<img alt="Next >>" src="../next_button.jpg" />
</testing>
freebie:~ 678> xmllint --noout foo.xml                                
+  9:34:29
freebie:~ 679>                                                        
+  9:34:35

[download]

In reply to Re^4: how to strip XML into Plain Text file by Fletch
in thread how to strip XML into Plain Text file by dbrock

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