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.. currentmodule:: jsonschema.validators
.. _creating-validators:
=======================================
Creating or Extending Validator Classes
=======================================
.. autofunction:: create
:noindex:
.. autofunction:: extend
:noindex:
.. autofunction:: validator_for
:noindex:
.. autofunction:: validates
:noindex:
Creating Validation Errors
--------------------------
Any validating function that validates against a subschema should call
``descend``, rather than ``iter_errors``. If it recurses into the
instance, or schema, it should pass one or both of the ``path`` or
``schema_path`` arguments to ``descend`` in order to properly maintain
where in the instance or schema respectively the error occurred.
The Validator Protocol
----------------------
``jsonschema`` defines a `protocol <typing.Protocol>`, `jsonschema.protocols.Validator` which can be used in type annotations to describe the type of a validator.
For full details, see `validator-protocol`.
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