A minor ambiguity in the xliff spec

Extract from current 1.1 spec

match-quality

Match quality - The match quality of the <alt-trans> 
element is tool specific and can be a score expressed in percentage or an 
arbitrary value (e.g. match-quality="high").

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I want to represent match quality as a 
percentage

Do I say: 

    
match-quality="95%"

or 

    
match-quality="95"

Or should this not 
matter

Mat