isIRI or isURI

The document uses both isIRI (sec 11.2) and isURI (example, grammar).  The 
tests uses isURI.  I can't find a use isIRI in the email archives.

Which should it be?  Or both?

Also:

11.2.3.3 says:

"Returns whether a variable is bound to a URI."

which should be IRI?

	Andy