Insert element into sequence problem

[Armin Töpfer]

Hi all,

I have a problem with adding an element to a sequence. Some important
snippets for this scenario:

Schema:
  <xs:element name="outputElement">
    <xs:complexType>
      <xs:sequence>
        <xs:element maxOccurs="unbounded" name="output" type="xs:string"/>
      </xs:sequence>
    </xs:complexType>
  </xs:element>

WSDL message:
  <message name="outputMessage">
    <part element="ns_xs:outputElement" name="outputType"/>
  </message>

Variable:
<variable messageType="ns2:outputMessage" name="StartWorkflowOutVar"
xmlns:ns2="http://esysbio.bccs.uib.no/schema/MyWorkflow"/>

Initialization of variable:
<assign>
            <copy>
                <from>
                    <literal>
                        <tns_6:outputElement

xmlns:tns_6="http://esysbio.bccs.uib.no/schema/MyWorkflow/xsd";>
                            <tns_6:output/>
                        </tns_6:outputElement>
                    </literal>
                </from>
                <to variable="StartWorkflowOutVar" part="outputType" />
            </copy>
</assign>

This works fine, but I want to add dynamically more <output/> elements
to <outputElement/>. At that point I fail.
I tried many different things, none of them worked. One of those is:
<assign insert="last">
            <copy>
                <from>
                    <literal>
                        <tns_6:output
xmlns:tns_6="http://esysbio.bccs.uib.no/schema/MyWorkflow/xsd"/>
                    </literal>
                </from>
                <to>$StartWorkflowOutVar.outputType</to>
            </copy>
</assign>

Please help me. I hope I provide all information you need.

Regards,
Armin