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					Originally Posted by  nathanpinard
					 
				 
				I meant the NCX in terms of nesting. If there was any kind of tool to validate to see if there is some extra, or missing code. 
			
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 If you have a Windows or Linux machine, you could check the NCX for 
well-formedness with 
XML Copy Editor (freeware).
Simply create a blank XML/XHTML document with XML Copy Editor, paste the contents of the NCX file into it and press F2 to check the NCX file for well-formedness.