```Python
q: Union[str, None] = Query(default=None, max_length=50)
```

Cela va valider les données, montrer une erreur claire si ces dernières ne sont pas valides, et documenter le paramètre dans le schéma `OpenAPI` de cette *path operation*.

## Rajouter plus de validation

Vous pouvez aussi rajouter un second paramètre `min_length` :

			expectedPostCleanFile:  testDataDir + "/expected/minikube_cni.conflist.clean",
			cniConfDirOrderedFiles: []string{"minikube_cni.conf", "calico.conflist"},
		},
		{
			name:                   "Skip non-json file for first valid .conf file",
			chainedCNIPlugin:       true,
			resultFileName:         "01-minikube_cni.conflist",
			expectedOutputFile:     testDataDir + "/expected/minikube_cni.conflist.expected",

                  Valid Options: FAIL_CLOSE, FAIL_OPEN
                enum:
                - FAIL_CLOSE
                - FAIL_OPEN
                type: string
              imagePullPolicy:
                description: |-
                  The pull behaviour to be applied when fetching Wasm module by either OCI image or `http/https`.

                  Valid Options: IfNotPresent, Always
                enum:

	case TABULAR:
		err = w.printSecretItemsTabular(secrets)
	}
	return err
}

var (
	secretItemColumns = []string{"RESOURCE NAME", "TYPE", "STATUS", "VALID CERT", "SERIAL NUMBER", "NOT AFTER", "NOT BEFORE"}
	secretDiffColumns = []string{"RESOURCE NAME", "TYPE", "VALID CERT", "NODE AGENT", "PROXY", "SERIAL NUMBER", "NOT AFTER", "NOT BEFORE"}
)

// printSecretItemsTabular prints the secret in table format

		if err != nil {
			log.Debugf("failed to parse secret resource %s from source %s: %v",
				s.name, s.source, err)
			result.Valid = false
			return result, nil
		}
		result.SecretMeta = meta
		result.Valid = meta.Valid
		return result, nil
	}
	result.Valid = false
	return result, nil
}

// GetEnvoySecrets parses the secrets section of the config dump into []SecretItem
func GetEnvoySecrets(

    "description": "An optional description",
    "price": 45.2,
    "tax": 3.5
}
```

...`description` et `tax` étant des attributs optionnels (avec `None` comme valeur par défaut), cet "objet" JSON serait aussi valide :

```JSON
{
    "name": "Foo",
    "price": 45.2
}
```

## Déclarez-le comme paramètre

/**
 * Allows a fixed set of properties that are valid inside a version and that could be overwritten for example on the
 * commandline
 *
 * @deprecated use {@link org.apache.maven.api.services.ModelBuilder} instead
 */
@Deprecated(since = "4.0.0")
public interface ModelVersionProcessor {

    /**
     * @param property the property to check
     * @return <code>true</code> if this is a valid property for this processor
     */

        <profile>
            <id>!invalid-id</id>
        </profile>
        <profile>
            <id>?invalid-id</id>
        </profile>
        <profile>
            <id>valid-id</id>
        </profile>
        <profile>
            <id>valid?-jdk9+!</id>
        </profile>
    </profiles>

import org.codehaus.plexus.components.secdispatcher.SecDispatcher;

import static org.apache.maven.cling.invoker.mvnenc.DefaultEncryptInvoker.ERROR;

/**
 * The support class for goal implementations that requires valid/workable config.
 */
public abstract class ConfiguredGoalSupport extends GoalSupport {
    protected ConfiguredGoalSupport(MessageBuilderFactory messageBuilderFactory, SecDispatcher secDispatcher) {

                result.getErrors().get(0), "'build.plugins.plugin.version' for test:mip must be a valid version");
        assertContains(
                result.getErrors().get(1), "'build.plugins.plugin.version' for test:rmv must be a valid version");
        assertContains(
                result.getErrors().get(2), "'build.plugins.plugin.version' for test:lmv must be a valid version");
        assertContains(
                result.getErrors().get(3),