Web Service XML not attaching namespace to value object

Question

I have a web services that I have introspected into Flex. The web service has one operation that sends 4 objects to the server.
The objects are: a number, an array of objects, a schedule object and a boolean. For some reason when the XML is sent, everything excecpt the object in the array has a namespace. The XML for the object looks something like this:
      <Servers>
        <tns:Tag>123456</tns:Tag>
        <tns:IP>10.35.155.190</tns:IP>
        <tns:useDHCP>true</tns:useDHCP>
        <tns:ipAddress />
        <tns:subNetmask />
        <tns:defaultGateway />
        <tns:hostName xsi:nil="true" />
        <tns:Domain>true</tns:Domain>
        <tns:ProfileId>50000</tns:ProfileId>
      </Servers>
What could be preventing this array of objects from getting the namespace?

Answer 1

What is the xmlns= for the file?