SOAP - complexType

I've need to access a web service written in java using a visual basic client.
How i can handle the following complexType (defined in the wsdl of the web service)?


<complexType name="Map">
<sequence>
<element maxOccurs="unbounded" minOccurs="0" name="item">
<complexType>
<all>
<element name="key" type="xsd:anyType" />
<element name="value" type="xsd:anyType" />
</all>
</complexType>
</element>
</sequence>
</complexType>


Thanks
Alessio