Many function results seem to have spurious spaces after and before the " 
delimiting the string results (This was not the case in earlier drafts). 

For example, one example says:

- fn:normalize-space(()) returns " ".
instead of
- fn:normalize-space(()) returns "".

and

 - fn:substring-before ( "tattoo", "attoo") returns " t ". (should be "t")
- fn:substring-before ( "tattoo", "tatto") returns " ". ("")
- fn:substring-before ((), ()) returns " ". ("")

There are many more.
Please fix the underlying problem (stylesheet?).