anchor.diff:  In this guide, we build a simple GraphQL application that exposes a GraphQL API
   at `/graphql`.
   
  -This example was inspired by a popular GraphQL API
  +This example was inspired by a popular GraphQL API.
   
   == Solution
   
  
positive.code: and enables powerful developer tools.
  
  **GraphQL** was originally developed by **Facebook** in 2012 and has been
  a open standard since 2015.
  
  GraphQL is not a replacement for REST API specification but merely a
  alternative. Unlike REST GraphQL API's have a ability to benefit the client by:
  
  Preventing Over-fetching and Under-fetching::
      REST API's are server-driven fixed data responses that can not be determined by
      the client. Although the client does not require all the fields the client
      must retrieve all the data hence `Over-fetching`. A client may also require
      multiple REST API calls according to the first call (HATEOAS) to retrieve
  
negative.code: 
  == Expanding the API
  
  Until now, we have created a GraphQL API to retrieve film data.
  We now want to enable the clients to retrieve the `Hero` data of the `Film`.
  
  Add the following to our `FilmResource` class:
  