schema {
  query: Query
  mutation: Mutation
}

type Query {
  getPost(id: String!): Post
  sayHello(name: String): String
  sayGoodbye(name: String): String
}

type Mutation {
  addPost(author: String!, title: String!, content: String!): Post!
}

type Post {
  id: String!
  author: String
  title: String
  content: String
  ups: Int!
  downs: Int!
  version: Int!
}