Sheet API parse error

Going on the "getting started" guide, http://writer.zoho.com/public/help/sheet.Gettingstarted/noband

I'm passing just the basics.

<methodCall><methodName>zohosheet.userView.getWorkbooks</methodName><params></params></methodCall>

Doing it the same way I did for the Writer but I'm getting a parse error - error 2400

Should it not be something more than that? Like

<?xml version=\'1.0\' encoding=\'UTF-8\'?><methodCall xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance' xsi:noNamespaceSchemaLocation='http://sheet.zoho.com/schema/document.xsd'><methodName>zohosheet.userView.getWorkbooks</methodName><params></params></methodCall>