A given spreadsheet may contain multiple worksheets. For each spreadsheet, there's a worksheets metafeed listing all the worksheets in that spreadsheet.
Given the spreadsheet key from the <id> of a
Zend_Gdata_Spreadsheets_SpreadsheetEntry
object you've already retrieved, you can fetch a feed
containing a list of worksheets associated with that spreadsheet.
<?php
$query = new Zend_Gdata_Spreadsheets_DocumentQuery();
$query->setSpreadsheetKey($spreadsheetKey);
$feed = $spreadsheetService->getWorksheetFeed($query);
The resulting Zend_Gdata_Spreadsheets_WorksheetFeed
object feed represents the response from the server. Among other
things, this feed contains a list of
Zend_Gdata_Spreadsheets_WorksheetEntry
objects ($feed->entries), each of which represents a
single worksheet.