Here are 73 test cases that detail the kinds of schemas that PHP5 currently supports and the structures you are expected to plug into them for the return value from your services. Much better than trying to guess!
http://cvs.php.net/co.php/pecl/soap/tests/schema
You can cycle through the listings by changing the main index in the URL below, rather than go in and out of the pages
http://cvs.php.net/co.php/pecl/soap/tests/schema/schema052.phpt?r=1.2
I downloaded the whole thing with this, CVS might work too.
http://www.httrack.com/
With them all downloaded I just browse them with Textpad.