How to add attributes to node

Question

 

Hi all of you, I hope to be clear (sorry for my English).

 

I need to create the following soap xml.

 

<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" xmlns:tem="http://tempuri.org/">
   <soapenv:Header/>
   <soapenv:Body>
      <tem:ventas>
         <!--Zero or more repetitions:-->
         <tem:venta attr1="?" attr2 ="?">
            <!--Zero or more repetitions:-->
            <tem:material attr1="?" attr2 ="?"/>
         </tem:venta>
      </tem:ventas>
   </soapenv:Body>
</soapenv:Envelope>

I am writing a Service Contract like this: 

namespace Arx2Casa
{

    [DataContract]
    public class material
    {
        [XmlAttribute]
        public string attr1 { get; set; }
        [XmlAttribute]
        public string attr2 { get; set; }
    }

    [ServiceContract]
    [XmlSerializerFormat]
    public interface Arx2CasaIntf
    {
        [OperationContract]
        string ventas(material[] venta);
    }

}

That contract generate the following REQUEST

 

<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" xmlns:tem="http://tempuri.org/">
   <soapenv:Header/>
   <soapenv:Body>
      <tem:ventas>
         <!--Optional:-->
         <tem:venta>
            <!--Zero or more repetitions:-->
            <tem:material attr1="?" attr2="?"/>
         </tem:venta>
      </tem:ventas>
   </soapenv:Body>
</soapenv:Envelope>

How do I add attibutes to <tem:venta> node?

 

Is there other way to do that?

 

Thanks for you support.

 

Regards