public static ComplexGraphType <IPublishedContent> AddUmbracoBuiltInProperties(this ComplexGraphType <IPublishedContent> graphType)
{
// TODO: set this field name as a reserved property alias
graphType.Field <PublishedContentDataGraphType>("_contentData", "Built in published content data.", resolve: context => context.Source).SetDoctypeMetadata(graphType.GetMetadata <string>("documentTypeAlias"));
return(graphType);
}