Qry : behviour on mismatch of xml:lang and corresponding content

Hi,
   
  Ref : http://www.w3.org/TR/xml/
  (W3C Recommendation 16 August 2006, edited in place 29 September 2006)
   
  "In document processing, it is often useful to identify the natural or formal language in which the content is written."
   
  what may be the outcome if 
   
  xml:lang="en-US"  and corresponding content is in Non-English like script, say for example content is in Gujarati Language. (may be by mistake or intentionally)
   
  should corresponding xml-processor/related system/comonent  report any error ?
   
   
   
  --Raxit Sheth
  raxitsheth2000@yahoo.co.in
   
   

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