code: def is_schema_of_common_names(schema: GraphQLSchema) -> bool:
      
      query_type = schema.query_type
      if query_type and query_type.name != "Query":
          return False
  
      mutation_type = schema.mutation_type
      if mutation_type and mutation_type.name != "Mutation":
          return False
  
      subscription_type = schema.subscription_type
      if subscription_type and subscription_type.name != "Subscription":
          return False
  
      return True
docs: Check whether this schema uses the common naming convention.
  
      GraphQL schema define root types for each type of operation. These types are the
      same as any other type and can be named in any manner, however there is a common
      naming convention:
  
      schema {
        query: Query
        mutation: Mutation
      }
  
      When using this naming convention, the schema description can be omitted.