public void Collect(Mono.Cecil.TypeDefinition td, TypeCollection typeCollection, ConfigBase config)
        {
            if (td.ShouldIgnoreType())
            {
                return;
            }

            // don't duplicate types
            if (typeCollection.Contains(td.FullName))
            {
                return;
            }

            StringBuilder sb = new StringBuilder();
            var indentCount = 0;
            ITypeWriter typeWriter = typeSelector.PickTypeWriter(td, indentCount, typeCollection, config);

            td.Interfaces.Each(item =>
            {
                var foundType = typeCollection.LookupType(item);

                if (foundType == null)
                {
                    //TODO: This reporting a missing type is too early in the process.
                    // typeNotFoundErrorHandler.Handle(item);
                    return;
                }

                var itemWriter = typeSelector.PickTypeWriter(foundType, indentCount, typeCollection, config);
                typeCollection.Add(foundType.Namespace, foundType.Name, itemWriter);

            });

            typeCollection.Add(td.Namespace, td.Name, typeWriter);
        }