Advances this and retrieves the next attribute/value.
false is returned if an error has occurred (in which case throws is set),
or if the end of the iteration is reached (in which case
value are set to
null and the iterator becomes invalid). If true is returned, next may be
called again to receive another attribute/value pair.
Note that the same
attribute may be returned multiple times, since URIs allow repeated attributes.
an initialized UriParamsIter
on return, contains the attribute, or null.
on return, contains the value, or null.
false if the end of the parameters has been reached or an error was encountered. true otherwise.