{* ../../docs_src/body_nested_models/tutorial005_py310.py hl[2,8] *}

The string will be checked to be a valid URL, and documented in JSON Schema / OpenAPI as such.

## Attributes with lists of submodels { #attributes-with-lists-of-submodels }

You can also use Pydantic models as subtypes of `list`, `set`, etc.:

     * @return The script engine.
     */
    public ScriptEngine getScriptEngine(final String name) {
        if (name == null) {
            throw new ScriptEngineException("Script engine name parameter is null. A valid script engine name must be provided.");
        }
        final ScriptEngine scriptEngine = scriptEngineMap.get(name.toLowerCase(Locale.ROOT));
        if (scriptEngine != null) {
            return scriptEngine;
        }

     * another goal of the same plugin.
     * @return the goal
     */
    @Nonnull
    String goal() default "";

    /**
     * Lifecycle id of the lifecycle that defines {@link #phase()}. Only valid in combination with {@link #phase()}. If
     * not specified, Maven will use the lifecycle of the current build.
     *
     * @see <a href="https://maven.apache.org/maven-plugin-api/lifecycle-mappings.html">Lifecycle Mappings</a>

		1: {bucketName: "------", objName: "obj", inputData: []byte(""), expectedError: BucketNameInvalid{Bucket: "------"}},
		2: {
			bucketName: "$this-is-not-valid-too", objName: "obj", inputData: []byte(""),
			expectedError: BucketNameInvalid{Bucket: "$this-is-not-valid-too"},
		},
		3: {bucketName: "a", objName: "obj", inputData: []byte(""), expectedError: BucketNameInvalid{Bucket: "a"}},

		// Case with invalid object names.

	for _, rule := range lc.Rules {
		if rule.Transition.StorageClass != "" {
			if valid := globalTierConfigMgr.IsTierValid(rule.Transition.StorageClass); !valid {
				return errInvalidStorageClass
			}
		}
		if rule.NoncurrentVersionTransition.StorageClass != "" {
			if valid := globalTierConfigMgr.IsTierValid(rule.NoncurrentVersionTransition.StorageClass); !valid {
				return errInvalidStorageClass
			}
		}
	}
	return nil
}

```

El parámetro `name` **sigue siendo requerido** (no es *opcional*) porque no tiene un valor por defecto. Aun así, `name` acepta `None` como valor:

```Python
say_hi(name=None)  # Esto funciona, None es válido 🎉
```

La buena noticia es que, en la mayoría de los casos, podrás simplemente usar `|` para definir uniones de tipos:

```python
def say_hi(name: str | None):
    print(f"Hey {name}!")
```

        assertEquals(0, result);
    }

    @Test
    @DisplayName("Test readBytesWireFormat with valid structure size")
    void testReadBytesWireFormatValidStructureSize() throws SMBProtocolDecodingException {
        byte[] buffer = new byte[1024];
        int bufferIndex = 0;

        // Set structure size to 2 (valid)
        SMBUtil.writeInt2(2, buffer, bufferIndex);

# Hibernate Validator
# -------------------
constraints.CreditCardNumber.message = {item} is an invalid credit card number.
constraints.EAN.message = {item} is an invalid {type} barcode.
constraints.Email.message = {item} is not a valid email address.
constraints.Length.message = The length of {item} must be between {min} and {max}.
constraints.LuhnCheck.message = The Luhn Modulo 11 checksum of {value} is incorrect.

# Hibernate Validator
# -------------------
constraints.CreditCardNumber.message = {item} is an invalid credit card number.
constraints.EAN.message = {item} is an invalid {type} barcode.
constraints.Email.message = {item} is not a valid email address.
constraints.Length.message = The length of {item} must be between {min} and {max}.
constraints.LuhnCheck.message = The Luhn Modulo 11 checksum of {value} is incorrect.

                "path",
                "item_id"
            ],
            "msg": "value is not a valid integer",
            "type": "type_error.integer"
        }
    ]
}
```

你將會改而得到文字版：

```
Validation errors:
Field: ('path', 'item_id'), Error: Input should be a valid integer, unable to parse string as an integer
```