Why access_type and accessor in serializer?

Question

Doctrine ORM

serializer of Entity, example:

owner:
      type: "App\\Domain\\User\\User"
      serialized_name: owner
      groups: ['ad']
    typeTextPresentation:
      type: string
      access_type: public_method
      serialized_name: typeTextPresentation
      groups: ['ad']
      accessor:
        getter: typeTextPresentation