How do I declare the return type of a SOAP method to be a map (in its WSDL)?

I am adding a method to a SOAP service. I would like this method to be able to return a map. More specifically it is map of lists (vectors/arrays). How would I capture this in its WSDL?

From stackoverflow

• Here's and XSD type for a regular map from string to string:

  <xsd:complexType name="MapDataType">
    <xsd:sequence>
      <xsd:element name="Pair" maxOccurs="unbounded" minOccurs="0">
        <xsd:complexType>
          <xsd:sequence>
            <xsd:element name="Key" type="xsd:string" maxOccurs="1" minOccurs="1"/>
            <xsd:element name="Value" type="xsd:string" maxOccurs="1" minOccurs="1"/>
          </xsd:sequence>
        </xsd:complexType>
      </xsd:element>
    </xsd:sequence>
  </xsd:complexType>
  

  Is this what you want? You'll need to use this as the type for your return value.

  I'm not sure what you mean by 'map of lists'

  Matthew Schinckel : I'd suggest that this is a fair method, considering there is no Map type in XML.