web_service.cs

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

namespace ProcessingService
{
    [DataContract(Namespace = "urn:just-applications:nventree:batch-v1.0")]
    public class Argument
    {
        [DataMember(IsRequired = true, Order = 0)]
        public string Key { get; set; }
        [DataMember(IsRequired = true, Order = 1)]
        public string Value { get; set; }
    }

    [DataContract(Namespace = "urn:just-applications:nventree:batch-v1.0")]
    public class BatchItem
    {
        [DataMember(IsRequired = true, Order = 0)]
        public List<Argument> Arguments { get; set; }        
    }

    [DataContract(Namespace = "urn:just-applications:nventree:batch-v1.0")]
    public class Batch
    {
        [DataMember(IsRequired = true, Order = 0)]
        public string Id { get; set; }
        [DataMember(IsRequired = true, Order = 1)]
        public string ProcessorKey { get; set; }
        [DataMember(IsRequired = true, Order = 2)]
        public List<BatchItem> Items { get; set; }
    }

    [ServiceContract(Name = "BatchQueueContract",   
        ConfigurationName = "BatchQueue",  
        Namespace = "urn:just-applications:nventree:batch-v1.0",
        SessionMode = SessionMode.Required)]
    public class BatchQueue
    {
        [OperationContract(IsOneWay = true)]
        public void Queue(Batch batch)
        {
            Console.WriteLine("Queued!");
        }
    }   
}