XSLT functions

I've got an action to say something about the functions that can be
used in XSLT match patterns. Here's a list of the additional functions
defined by XSLT (2.0):

document()
unparsed-text()
unparsed-text-available()
key()
format-number()
format-dateTime()
format-date()
format-time()
unparsed-entity-uri()
unparsed-entity-public-id()
generate-id()

Do we say that these are required/forbidden/implementation-defined in
match patterns?

I'm tempted to say they're forbidden, just for simplicity.

                                        Be seeing you,
                                          norm

-- 
Norman Walsh <ndw@nwalsh.com> | No matter how cynical I get, I find I
http://nwalsh.com/            | just can't keep up.--Lily Tomlin