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definitions:
  Identity:
    type: integer
    format: int64
    minimum: 1

  Common:
    properties:
      id:
        $ref: '#/definitions/Identity'
      created_at:
        type: dateTime

  Book:
    allOf:
      - $ref: '#/definitions/Common'
    properties:
      language:
        type: nvarchar
        maxLength: 2

tables:
  Book:
    name: books
    description: Table to stores book information.
    columns:
      $ref: '#/definitions/Book'

Exception occurred:
  File "/home/odc/.local/lib/python3.10/site-packages/sphinxcontrib/dd/yaml.py", line 48, in _do_resolve
    if isinstance(node, collections.Mapping) and '$ref' in node:
AttributeError: module 'collections' has no attribute 'Mapping'
The full traceback has been saved in /tmp/sphinx-err-a8_3ays0.log, if you want to report the issue to the developers.
Please also report this if it was a user error, so that a better error message can be provided next time.
A bug report can be filed in the tracker at <https://github.com/sphinx-doc/sphinx/issues>. Thanks!
make: *** [Makefile:34: html] Error 2