Re: [xsl] are all strings in a sequence valid potential QNames

[ac <ac@xxxxxxxxxxxxx>]

Hi,

Michael, thank you for clearing this out.
David and Ken thank you for still taking the time to work out the regex 
for QNames.

I think I know why I had not thought about "castable as" in the first 
place ...

Cheers,
ac



> 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   
>
>   
> > -----Original Message-----
> > From: ac [mailto:ac@xxxxxxxxxxxxx] 
> > Sent: 03 February 2010 07:30
> > To: xsl-list@xxxxxxxxxxxxxxxxxxxxxx
> > Subject: [xsl] are all strings in a sequence valid potential QNames
> >
> > Hi List,
> >
> > As for example, in determining element and/or attribute names 
> > from the first line of a csv file, as well as other similar 
> > cases, with xslt2.0 (e.g. without "map", "try", and schema), 
> > what is the best way to check (e.g. true/false) that 1. a 
> > string is a valid potential QName (e.g. match + what regex?, 
> > or other option) 2. all strings in a sequence are valid 
> > potential QNames
> >
> > Thank you,
> > ac