argument for id function

>From another discussion group,  the following confusion comes up 
on the argument of the id function:

1. From the XSLT 1.0, XSLT grammer production 3 under section 5.2 indicates
the argument
   to id function has to be a literal, i.e. a string enclosed in single or
double quotes.

2. From the XPath 1.0, section 4.1 indicates the argument can be other than
a
    string.

It seems that XSLT 1.0 says that the argument to id function must be
a literal in syntax while XPath says it doesn't have to be. Which is
correct?

- Tak Sze


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