Nested Custom Class as input parameter in web method

Hi,

I am working on a web service method while will accept custom class as array
and output antoher custom class. My code is

public class a
  public str1 as string
  public str2 as string
  public str3 as b()
end class

public class b
  public str4 as string
end class

and my webmethod signature is
Public Function GETLIST(ByVal te As a())

Class a will have multiple types of class b.

Now in webmethod, I am taking class a as input parameter as an array. When I
compile this code and see the soap xml file, I can see class a variables but
not class b. It just shows with out any elements.

After going through the emails and discussion forums, I have tried
xmlinclude and soap include at class level and wemethod level, but nothing
works.

please suggest what is wrong with the above code.

regards,
hari. ...