SOAP Complex Type Variable

I am building a webservice using PEAR SOAP and I need to define a complex type which can take input like following:

<EquipmentInfo>
            <Equipment>
                        <EquipmentTypeId></EquipmentTypeId>
                        <Quantity></Quantity>
            </Equipment>
            <Equipment>
                        <EquipmentTypeId></EquipmentTypeId>
                        <Quantity></Quantity>
            </Equipment>
</EquipmentInfo>


EquipmentInfo variable needs to be defined as a sequence of elements of type Equipment. Equipment Type should have two sub-elements. Following is the source code but it doesn't produce correct WSDL.

class EquipOrder
{
             var $__dispatch_map = array();
             var $__typedef = array();

             function EquipOrder () {
                        $this->__typedef['Equipment'] =   array("EquipmentTypeId"=>"Integer", "Quantity"=>"Integer");

                        $this->__typedef['EquipmentInfo'] =  array(array('Equipment'=> "{urn:EquipOrder}Equipment"));
            }

}


Can someone please shed some light on it?

Thanks,
-Punit.