RE: sum function and math expressions
> Maybe the question should be reduced to: > > "What information is arguably lost in the identity transform?" > ... > > Within the restricted world-view of XSLT, of course (which we > frequently > adopt happily) the answer is "nothing", insofar as > "information" is defined > as "that which has been expressed in an XML information set > (as implemented > by a conformant XSLT processor). An XSLT processor knows nothing of > anything else. It's actually not quite "nothing". - unparsed entities make it into the XSLT input but not into its output - base URI is lost - the isID and isIDREF properties of elements and attributes are lost (I think - need to check) Michael Kay http://www.saxonica.com/
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