Re: redundancy in string(number(current())) = 'NaN' ??

  //sales[string(number(current()))='NaN']

  just to make sure, i'm assuming the "current()" part is 
  redundant, 


Not its not redundant. current() returns the node current when this
expression is evaluated (ie typically the node matched by the template
that contains this expression) number() or number(.) would use the
contect node at that part of the expression which would be each of the
sales nodes in turn.

having said that its a strange expression as the predicate doesn't
depend on the sales node to which it applies so either the above is
equivalent to
//sales
or to the empty node set, depending on whether the current node
is a number or not. Sometimes you have to do this though as xpath
doesn't have an if statement.

David

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