Re: are all strings in a sequence valid potential QNam
I think, this has been a great discussion. I completely missed the special case of "castable as" for xs:QName. I learnt (I've gone back to my memory lane :)) from Ken's post, that lexical & value space of xs:QName is different. The value space of xs:QName checks for a URI, and "castable as" works on a value and not on lexical representation. As has been told, "castable as" is not correct for this use case. As Mike suggests, I'll also go for a regex solution. On Thu, Feb 4, 2010 at 11:10 AM, Michael Kay <mike@xxxxxxxxxxxx> wrote: > > Just to check that by "valid potential QName" you mean a string that is in > the lexical space of xs:QName and will therefore constitute a valid QName > provided the prefix is in scope? > > ($x castable as xs:QName) will not work because (a) it also tests whether > the prefix is in scope, and (b) to avoid the issues of it therefore being > context-sensitive, the W3C spec says this is only allowed if the argument > ($x) is a string literal. > > So you do need to use the regex approach. > > Regards, > > Michael Kay > http://www.saxonica.com/ > http://twitter.com/michaelhkay -- Regards, Mukul Gandhi
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