/// <summary>
        /// Adds functions into the Poco code generator
        /// </summary>
        /// <param name="namespaceName">Namespace of functions to add</param>
        /// <param name="codeNamespace">Namespace to put static Extension type container</param>
        /// <param name="functions">functions from the model</param>
        protected override void AddFunctionsInNamespaceIfRequired(string namespaceName, CodeNamespace codeNamespace, IEnumerable<Function> functions)
        {
            // Only get functions that are bound to an entityType or collection other wise not interesting to add an extension method
            IEnumerable<Function> namespaceFunctions = functions.Where(func => func.NamespaceName == namespaceName && func.Annotations.OfType<ServiceOperationAnnotation>().Any(s => s.BindingKind.IsBound()));

            if (functions != null)
            {
                CodeTypeDeclaration functionExtensionClass = null;

                foreach (Function function in namespaceFunctions)
                {
                    // add the extension method container class
                    if (functionExtensionClass == null)
                    {
                        functionExtensionClass = codeNamespace.DeclareExtensionMethodContainerType(namespaceName + "ExtensionMethod");
                    }

                    this.DeclareExtensionMethod(functionExtensionClass, function);
                }
            }
        }