CloudFormation template for AWS AppSync (partial)

AppSyncAPI.yaml

  AppSyncApi:
    Type: "AWS::AppSync::GraphQLApi"
    Description: "The GraphQL API for the Notes App"
    Properties:
      AuthenticationType: "AMAZON_COGNITO_USER_POOLS"
      Name: !Sub ${APIName}
      UserPoolConfig:
        UserPoolId: !Ref UserPoolClient
        AwsRegion: !Sub ${AWS::Region}
        DefaultAction: "ALLOW"

  AppSyncSchema:
    Type: "AWS::AppSync::GraphQLSchema"
    Properties:
      ApiId: !GetAtt AppSyncApi.ApiId
      Definition: |
        type Note {
          NoteId: ID!
          title: String
          content: String
        }
        type PaginatedNotes {
          notes: [Note!]!
          nextToken: String
        }
        type Query {
          allNotes(limit: Int, nextToken: String): PaginatedNotes!
          getNote(NoteId: ID!): Note
        }
        type Mutation {
          saveNote(NoteId: ID!, title: String!, content: String!): Note
          deleteNote(NoteId: ID!): Note
        }
        type Schema {
          query: Query
          mutation: Mutation
        }
  AppSyncNotesTableDataSource:
    Type: "AWS::AppSync::DataSource"
    Properties:
      ApiId: !GetAtt AppSyncApi.ApiId
      Name: !Sub ${APIName}_notes_table
      Description: "The Notes Table AppSync Data Source"
      Type: AMAZON_DYNAMODB
      ServiceRoleArn: !GetAtt DynamoDBRole.Arn
      DynamoDBConfig:
        TableName: !Ref DynamoDBNotesTable
        AwsRegion: !Sub ${AWS::Region}

Have you tried to use extend keyword for schema so that the schema can be modularized and distributed to different yml files?

extend type Query {
  me: Me!
}
type Me {
  name: String!
}