Thank you for posing in the MSDN newsgroup.

As for the WebMethod Parameter object's XSD Schema description, it will
follow the following rule:

1. If the paramter is of value type, such as those primitive types, int,
long ,.... or some other structs like Datetime, the minOccurs for element
in <sequence> is assigned to "1". This is because value type should always
has a certain valid instance existed.

2.If the parameter is of reference type, such as string, or other classes,
the minOccurs attribute for the element will always be 0, because for
reference type in .NET, it could be set to "Null" which correspond to the
minOccurs=0.

so for your scenario, if you do want to make the paramter be declared as
minOccurs=1 in the XSD schema, you may consider use a ValueType class(in c#
,  use "struct" keyword to declare the type) to encapsulate that
ArrayObject.

Thanks & Regards,

Steven Cheng
Microsoft Online Community Support

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=The best way will be to treat the array as a contained array when it's
serialized. At the moment you just have it outputting as a list of
elements, hence the minimum has to be zero as there might not be
anything in the array.

using System.Xml.Serialization;

[WebMethod]
public string HelloWord(
[XmlArray("items", IsNullable=true), XmlArrayItem("item",
typeof(MyClass))] MyClass[] items)
{
return "Hello";
}

Josh
http://www.thejoyofcode.com/