Yes, castability is not transitive. Well spotted.

You get some pretty strange results with boolean() too, e.g.

boolean(string(false())) => true().

Michael Kay
Saxonica 

On 21 Feb 2014, at 16:18, Ihe Onwuka <ihe.onwuka@xxxxxxxxx> wrote:

> 3 castable as xs:integer -> true
> 
> "3" castable as xs:integer -> true
> 
> 3.5 castable as xs:integer -> true ..... hmmmmm debatable that one
> 
> ok...(scratches head)....so if it's roundable to an integer it's
> castable to an integer
> 
> fine
> 
> "3.5" castable as xs:integer -> false
> 
> Btw which list is the home for XPath stuff.