The same way as with Pydantic models, you declare class attributes with type annotations, and possibly default values.

You can use all the same validation features and tools you use for Pydantic models, like different data types and additional validations with `Field()`.

=== "Pydantic v2"

    ```Python hl_lines="2  5-8  11"
    {!> ../../../docs_src/settings/tutorial001.py!}
    ```

=== "Pydantic v1"

        }

        if (ruleMethod.getTypeParameters().length > 0) {
            problems.add(ruleMethod, "Cannot have type variables (i.e. cannot be a generic method)");
        }

        // TODO validations on method: synthetic, bridge methods, varargs, abstract, native
        ModelType<?> returnType = ModelType.returnType(ruleMethod);
        if (returnType.isRawClassOfParameterizedType()) {

        failure.assertHasErrorOutput "Disable this check by adding 'dependencies-without-versions' to the suppressed validations of the :generateMetadataFileForMavenPublication task."
    }

    @Issue("https://github.com/gradle/gradle/issues/23030")
    def "can disable validation of dependencies without versions"() {
        given:
        settingsFile.text = """
            rootProject.name = 'root'
        """

Task ordering can be useful in a number of scenarios:

* Enforce sequential ordering of tasks (e.g., `build` never runs before `clean`).
* Run build validations early in the build (e.g., validate I have the correct credentials before starting the work for a release build).

}
----

In the example, the application code uses Google's `guava` libraries.
Guava provides utility methods for collections, caching, primitives support, concurrency, common annotations, string processing, I/O, and validations.

=== 4. Set properties

A plugin can add properties and methods to a project using extensions.

	XMapType               *string                                      `json:"x-kubernetes-map-type,omitempty"`
	XValidations           *v1.ValidationRules                          `json:"x-kubernetes-validations,omitempty"`
}

// JSONSchemaPropsApplyConfiguration constructs an declarative configuration of the JSONSchemaProps type for use with
// apply.

	XMapType               *string                                      `json:"x-kubernetes-map-type,omitempty"`
	XValidations           *v1beta1.ValidationRules                     `json:"x-kubernetes-validations,omitempty"`
}

// JSONSchemaPropsApplyConfiguration constructs an declarative configuration of the JSONSchemaProps type for use with
// apply.

    }

    return NO_SUFFIX_FOUND;
  }

  /**
   * Returns an instance of {@link InternetDomainName} after lenient validation. Specifically,
   * validation against <a href="http://www.ietf.org/rfc/rfc3490.txt">RFC 3490</a>
   * ("Internationalizing Domain Names in Applications") is skipped, while validation against <a
   * href="http://www.ietf.org/rfc/rfc1035.txt">RFC 1035</a> is relaxed in the following ways:
   *
   * <ul>

!!! check "Inspired **FastAPI** to"
    Define extra validations for data types using the "default" value of model attributes. This improves editor support, and it was not available in Pydantic before.

    This actually inspired updating parts of Pydantic, to support the same validation declaration style (all this functionality is now already available in Pydantic).

    }

    return NO_SUFFIX_FOUND;
  }

  /**
   * Returns an instance of {@link InternetDomainName} after lenient validation. Specifically,
   * validation against <a href="http://www.ietf.org/rfc/rfc3490.txt">RFC 3490</a>
   * ("Internationalizing Domain Names in Applications") is skipped, while validation against <a
   * href="http://www.ietf.org/rfc/rfc1035.txt">RFC 1035</a> is relaxed in the following ways:
   *
   * <ul>