private static IList<ParameterDescription> GetParameterDescriptions(ModelDescription modelDescription) {
            var complexTypeModelDescription = modelDescription as ComplexTypeModelDescription;
            if (complexTypeModelDescription != null)
            {
                return complexTypeModelDescription.Properties;
            }

            var collectionModelDescription = modelDescription as CollectionModelDescription;
            if (collectionModelDescription != null)
            {
                complexTypeModelDescription =
                    collectionModelDescription.ElementDescription as ComplexTypeModelDescription;
                if (complexTypeModelDescription != null)
                {
                    return complexTypeModelDescription.Properties;
                }
            }

            return null;
        }

        private static ParameterDescription AddParameterDescription(HelpPageApiModel apiModel,
            ApiParameterDescription apiParameter, ModelDescription typeDescription)
        {
            ParameterDescription parameterDescription = new ParameterDescription
            {
                Name = apiParameter.Name,
                Documentation = apiParameter.Documentation,
                TypeDescription = typeDescription,
            };

            apiModel.UriParameters.Add(parameterDescription);
            return parameterDescription;
        }