QName encoding

Dear EXI members,

I have a remark concerning the 7.1.7 QName section of the current Working Draft.
The last sentence of the second paragraph says: " If the QName is in no namespace, the URI is represented by a zero length String."

Does it mean that the URI of such QName to consider is "":"", i.e. empty prefix with empty URI ?
I think it would be good to clarify the notion of "zero length String" since it is mentionned only there.

Regards,

--
    Franck.