Code review comment for lp:~zorba-coders/zorba/tokenize

Is there an example that works with streaming?
I wasn't able to make the following work:
import module namespace http = "http://www.zorba-xquery.com/modules/http-client";

declare namespace h = "http://expath.org/ns/http-client";

let $item := http:send-request(<h:request href="https://stream.twitter.com/1/statuses/sample.json?delimited=length"
                                          method="GET"
                                          username="wcandillon"
                                          password="wnvbb86g"
                                          override-media-type="text/plain"
                               />
                               ,
                               "https://stream.twitter.com/1/statuses/sample.json?delimited=length",
                               ()
                                )[2]
for $tweet in tokenize($item,"a")
return $tweet

Where:
import module namespace http = "http://www.zorba-xquery.com/modules/http-client";

declare namespace h = "http://expath.org/ns/http-client";

let $item := http:send-request(<h:request href="https://stream.twitter.com/1/statuses/sample.json?delimited=length"
                                          method="GET"
                                          username="wcandillon"
                                          password="wnvbb86g"
                                          override-media-type="text/plain"
                               />
                               ,
                               "https://stream.twitter.com/1/statuses/sample.json?delimited=length",
                               ()
                                )[2]
return $item

streams fine.
What am I missing?