Having the redundant ns declarations bloats the file and slows parsing.  I do
not know if it bloats/slows transmission of a similar hierarchy such as an
array of objects converted with XmlSerializer in the following web service:

[WebMethod]
MyStruct[] foo() {
  MyStruct[] bar = new MyStruct[5];
  for (int i = 0; i < 5 ++i) {
     bar[i] = new MyStruct();
  }
  return bar;
}

Does each MyStruct in bar have its own namespace declaration in transit as
below, or does each MyStruct inherit the namespace declaration of
ArrayOfMyStruct?

<ArrayOfMyStruct xmlns="http://yadayada">
 <MyStruct xmlns="http://yadayada">
   ...
 </MyStruct>
 <MyStruct xmlns="http://yadayada">
   ...
 </MyStruct>
 ...
</ArrayOfMyStruct>

I am just trying to optimize my program for transmission/space/UI-latency
and XML handling is often a major offender.  Having an Xml web-service that
transmits twice as much information as is necessary to yield the same effect
is silly, annoying, and detracts from a product that consumes it.

Greg