I am creating API from demo version of 
http://code.google.com/apis/base/samples/php/php-sample.html
with itemtype='Products'

The problem is where can I obtain link with the rel="next" for item
feeds?
My code is :
function getItems($token) {
  $ch = curl_init();    /* Create a CURL handle. */
  global $developerKey, $itemsFeedURL;

  curl_setopt($ch, CURLOPT_URL, $itemsFeedURL . "?max-results=50");
  curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
  curl_setopt($ch, CURLOPT_HTTPHEADER, array(
    'Content-Type: application/atom+xml',
    'Authorization: AuthSub token="' . trim($token) . '"',
    'X-Google-Key: key=' . $developerKey
  ));

  $result = curl_exec($ch);  /* Execute the HTTP command. */
  curl_close($ch);
  /* Parse the resulting XML. */
  $xml_parser = xml_parser_create();
  xml_set_element_handler($xml_parser, "startElement", "endElement");

  xml_set_character_data_handler($xml_parser, "characterData");
  xml_parse($xml_parser, $result);
  xml_parser_free($xml_parser);
}

To list items I have used max-results=50 as above but I have round
about 1000 products. I want to display 100 products per page. How can
I do that?

If any one know the solution of this problem then please send a reply.
I really thankful to you.
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