Hi Simon, Thanks for the detailed response. I'm slowly working through the intricacies of SDO. With your pointers, I was able to make good progress, but I'm stuck on one point -- populating SDO so that my result set gets properly translated to the SOAP client caller.
On the associate array issue, I've reworked my thinking. I've worked out the following schema that accommodates my structure: <?xml version="1.0" encoding="UTF-8"?> <xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"; targetNamespace="http://restorations";> <xs:element name="restorations"> <xs:complexType> <xs:sequence> <xs:element name="restoration" maxOccurs="unbounded"> <xs:complexType> <xs:sequence> <xs:element name="id" type="xs:integer" /> <xs:element name="description" type="xs:string" /> </xs:sequence> </xs:complexType> </xs:element> </xs:sequence> </xs:complexType> </xs:element> </xs:schema So, what I am looking for is a result set of 1 or more "restoration," with each restoration being composed of an "id" and "description." I created my class service that builds out a dummy result set: <?php Zend_Loader::loadClass('Labnet_API_LabnetOnline_001_Adapter'); /** * @service * @binding.soap * @types http://restorations ../../restorations.xsd */ class Labnet_API_LabnetOnline_001 { /** * Retrieves a list of restoration procedures available to the dental practice * * @param integer $lab_id Lab Identifier * @param string $practice_id Practice account code * @param string $practice_password Practice account password * @return restorations http://restorations */ public function getRestorations($lab_id, $practice_id, $practice_password) { $restorations = SCA::createDataObject('http://restorations', 'restorations'); $restorations->restoration[0]['id'] = 1; $restorations->restoration[0]['description'] = 'test'; $restorations->restoration[1]['id'] = 201; $restorations->restoration[1]['description'] = 'test 2'; return $restorations; } } ?> Using PHP SOAP, I built out a client that successfully calls the service, and dumps out the result. And this is where I have my problem: the resultant is empty: <?xml version="1.0" encoding="UTF-8"?> <SOAP-ENV:Envelope xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/";> <SOAP-ENV:Body> <tns:getRestorationsResponse xmlns="http://Labnet_API_LabnetOnline_001"; xmlns:tns="http://Labnet_API_LabnetOnline_001"; xmlns:tns2="http://restorations"; xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"; xsi:type="getRestorationsResponse"> <getRestorationsReturn/> </tns:getRestorationsResponse> </SOAP-ENV:Body> </SOAP-ENV:Envelope> I'm not sure why SCA is not able to build the XML from the populated SDO. I'm probably missing something totally obvious here. Any ideas? (I pasted my WSDL below should that help). Thanks again for helping me through the learning curve! Best, Mike <?xml version="1.0" encoding="UTF-8"?> <definitions xmlns="http://schemas.xmlsoap.org/wsdl/"; xmlns:tns2="http://Labnet_API_LabnetOnline_001"; xmlns:tns="http://schemas.xmlsoap.org/wsdl/"; xmlns:tns3="http://schemas.xmlsoap.org/wsdl/soap/"; xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"; targetNamespace="http://Labnet_API_LabnetOnline_001";> <types> <xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"; xmlns:ns0="http://restorations"; targetNamespace="http://Labnet_API_LabnetOnline_001"; elementFormDefault="qualified"> <xs:import schemaLocation="./restorations.xsd" namespace="http://restorations"/> <xs:element name="getRestorations"> <xs:complexType> <xs:sequence> <xs:element name="lab_id" type="xs:integer" nillable="true"/> <xs:element name="practice_id" type="xs:string" nillable="true"/> <xs:element name="practice_password" type="xs:string" nillable="true"/> </xs:sequence> </xs:complexType> </xs:element> <xs:element name="getRestorationsResponse"> <xs:complexType> <xs:sequence> <xs:element name="getRestorationsReturn" type="ns0:restorations" nillable="true"/> </xs:sequence> </xs:complexType> </xs:element> </xs:schema> </types> <message name="getRestorationsRequest"> <part name="getRestorationsRequest" element="tns2:getRestorations"/> </message> <message name="getRestorationsResponse"> <part name="return" element="tns2:getRestorationsResponse"/> </message> <portType name="Labnet_API_LabnetOnline_001PortType"> <operation name="getRestorations"> <input message="tns2:getRestorationsRequest"/> <output message="tns2:getRestorationsResponse"/> </operation> </portType> <binding name="Labnet_API_LabnetOnline_001Binding" type="tns2:Labnet_API_LabnetOnline_001PortType"> <operation name="getRestorations"> <input> <tns3:body xsi:type="tns3:tBody" use="literal"/> </input> <output> <tns3:body xsi:type="tns3:tBody" use="literal"/> </output> <tns3:operation xsi:type="tns3:tOperation" soapAction=""/> </operation> <tns3:binding xsi:type="tns3:tBinding" transport="http://schemas.xmlsoap.org/soap/http"; style="document"/> </binding> <service name="Labnet_API_LabnetOnline_001Service"> <port name="Labnet_API_LabnetOnline_001Port" binding="tns2:Labnet_API_LabnetOnline_001Binding"> <tns3:address xsi:type="tns3:tAddress" location="http://sandbox.int.labnet.net/michael/labnet_online/api/public _html/online001/index.php"/> </port> </service> </definitions> <!-- this line identifies this file as WSDL generated by SCA for PHP. 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