schema: |
  type ImageSegment {
    id: ID!
    upperLeftX: Float!
    upperLeftY: Float!
    lowerRightX: Float!
    lowerRightY: Float!
    sourceImage: Image! @hasInverse(field: segments)
  }

  extend type Image {
    segments: [ImageSegment] @hasInverse(field: sourceImage)
  }