Re: XSLT 2.0 empty string: Summary?

  If I can get past the DC math filter without reprimand, 

sorry not today...

  I think his point that the {}  empty set is a member of 
  any set was the Ah-ha moment for me.
  That's what  allows the as="xs:string?" to succeed rather than
  report the error.
 
The empty set isn't a _member_ of every set.
{} isn't a member of {1,2,3} for example.
It is a member of {{}} though (the set with one member, the empty set)
It is a _subset_ of every set.

David

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