nTier question on WCF Service

[mojo69]

I have two classes (Service1.cs and IService1.cs) in a WCF project.
Do I think of these as the Business Logic Layer or only as a passthrough to access the BLL, DLL, etc.? Also I think that there will a large number of functions in the BLL, is there a limit to the number of DataContracts or OperationContracts?

using System;
using System.Collections.Generic;
using System.Linq;
using System.Runtime.Serialization;
using System.ServiceModel;
using System.Text;
using System.Data;

namespace SomeServer4._1
{
    public class Service1 : IService1
    {
        public String Test()
        {
            return "HELLO";
        }

        public string GetData(int value)
        {
            return string.Format("You entered: {0}", value);
        }

        public CompositeType GetDataUsingDataContract(CompositeType composite)
        {
            if (composite == null)
            {
                throw new ArgumentNullException("composite");
            }
            if (composite.BoolValue)
            {
                composite.StringValue += "Suffix";
            }
            return composite;
        }

        public DataSet GetAPMF(String Company)
        {
            DataSet ds = new DataSet();
            return ds;
        }
    }
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Runtime.Serialization;
using System.ServiceModel;
using System.Text;
using System.Data;

namespace SomeServer4._1
{
    [ServiceContract]
    public interface IService1
    {
        [OperationContract]
        String Test();

        [OperationContract]
        string GetData(int value);

        [OperationContract]
        CompositeType GetDataUsingDataContract(CompositeType composite);

        [OperationContract]
        DataSet GetAPMF(String Company);
        // TODO: Add your service operations here
    }

    // Use a data contract as illustrated in the sample below to add composite types to service operations
    [DataContract(Name="SomeDataContract")] 
    public class CompositeType : IExtensibleDataObject
    {
        private ExtensionDataObject extensionDataObjectValue;
        public ExtensionDataObject ExtensionData
        {
            get
            {
                return extensionDataObjectValue;
            }
            set
            {
                extensionDataObjectValue = value;
            }
        }

        bool boolValue = true;
        string stringValue = "Hello ";

        [DataMember]
        public bool BoolValue
        {
            get { return boolValue; }
            set { boolValue = value; }
        }

        [DataMember]
        public string StringValue
        {
            get { return stringValue; }
            set { stringValue = value; }
        }
    }
}