href on p:store

Why is the default value for the href option on p:store the empty string?

I thought the semantic was that if href wasn't specified then the base
URI of the document on the source port was to be used.

                                        Be seeing you,
                                          norm

-- 
Norman Walsh <ndw@nwalsh.com> | 'I have done that,' says my memory. 'I
http://nwalsh.com/            | cannot have done that'--says my pride,
                              | and remains adamant. At last--memory
                              | yields.-- Nietzsche