serializing sequence of item using DataContractSerializer

is there a way to unserialize/serialize the following xml by using DataContractSerializer.

<?xml version="1.0" encoding="utf-8"?>
<test xmlns:xsi="http://ift.tt/ra1lAU" mlns:xsd="http://ift.tt/tphNwY">
  <id>someId</id>
  <st>s1</st>
  <st>s2</st>
</test>

this xml is given by the XmlSerializer part of following code

using System;
using System.Collections.Generic;
using System.Runtime.Serialization;
using System.Xml;
using System.Xml.Serialization;

namespace cledes {
    class Program {
        static void Main(string[] args) {
            TEST t = new TEST {
                Id = "someId",
                Sts = new List<String> {"s1", "s2"}
            };
            DataContractSerializer dcs = new DataContractSerializer(typeof(TEST));
            XmlSerializer xs = new XmlSerializer(typeof(TEST));
            XmlWriterSettings xws = new XmlWriterSettings();
            xws.OmitXmlDeclaration = true; xws.Indent = true;

            XmlWriter xw = XmlWriter.Create(Console.Out, xws);
            dcs.WriteObject(xw, t);
            xw.Flush();
            Console.WriteLine();
            Console.WriteLine("     =====     =====     =====");
            xs.Serialize(Console.Out, t);
            Console.WriteLine();
        }
    }

    [XmlRoot("test")]
    [DataContract(Name = "test", Namespace = "http://test.cledes")]
    public class TEST {
        [XmlElement("id")]
        [DataMember(Name= "id")]
        public String Id { get; set; }
        [XmlElement("st")]
        [DataMember(Name = "st")]
        public List<String> Sts { get; set; }
    }
}

the DataContractSerializer part gives

<test xmlns:i="http://ift.tt/ra1lAU" xmlns="http://test.cledes">
    <id>someId</id>
    <st xmlns:d2p1="http://ift.tt/1bQEByM">
        <d2p1:string>s1</d2p1:string>
        <d2p1:string>s2</d2p1:string>
    </st>
</test>

Here List<String> is just a sample. In my real case it is a List<ComplexType>.

I knew about CollectionDataContract but after googling a little, my guess is that DataContract does not allow to serialize:

<xsd:complexType name="test">
    <xsd:sequence>
        <xsd:element name="somId" type="string25" minOccurs="1" maxOccurs="1" />
        <xsd:element name="st" type="string25" minOccurs="1" maxOccurs="unbounded" />
    </xsd:sequence>
</xsd:complexType>

for example scvutil.exe reports that unbounds should be 1.

M I right (about inadaptation of DataContract to this case) or not ?

If I'm wrong, any clue is welcome (PS: I'm trying to keep XmlSerializer and DataContractSerializer).