* can be used as keys.
 *
 * @since 4.0.0
 */
@Experimental
public interface ExtensibleEnum {

    /**
     * The {@code id} uniquely represents a value for this extensible enum.
     * This id should be used to compute the equality and hash code for the instance.
     *
     * @return the id
     */
    @Nonnull
    String id();

	if n > 0 {
		c.h.Write(p[:n])
	}
	if errors.Is(err, io.EOF) {
		got := c.h.Sum(nil)
		if !bytes.Equal(got, c.want) {
			return n, ErrInvalidChecksum
		}
		return n, err
	}
	return n, err
}

// Close satisfies io.Closer
func (c Checker) Close() error {
	err := c.c.Close()
	if err == nil {
		got := c.h.Sum(nil)
		if !bytes.Equal(got, c.want) {
			return ErrInvalidChecksum
		}
	}
	return err

これらはOpenAPIスキーマに追加され、自動ドキュメントのインターフェースで使用されます:

<img src="/img/tutorial/path-operation-configuration/image01.png">

### Enumを使ったタグ { #tags-with-enums }

大きなアプリケーションの場合、**複数のタグ**が蓄積されていき、関連する*path operations*に対して常に**同じタグ**を使っていることを確認したくなるかもしれません。

このような場合、タグを`Enum`に格納すると理にかなっています。

**FastAPI** は、プレーンな文字列の場合と同じ方法でそれをサポートしています:

{* ../../docs_src/path_operation_configuration/tutorial002b_py310.py hl[1,8:10,13,18] *}

import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import org.jspecify.annotations.NullMarked;

/**
 * Implementation helper for {@link TestMapGenerator} for use with enum maps.
 *
 * @author Kevin Bourrillion
 */
@GwtCompatible
@NullMarked
public abstract class TestEnumMapGenerator implements TestMapGenerator<AnEnum, String> {

  @Override

package replication

//go:generate msgp -file=$GOFILE

// StatusType of Replication for x-amz-replication-status header
type StatusType string

// Type - replication type enum
type Type int

const (
	// Pending - replication is pending.
	Pending StatusType = "PENDING"

	// Completed - replication completed ok.
	Completed StatusType = "COMPLETED"

// Returns whole-file bitrot reader.
func newWholeBitrotReader(disk StorageAPI, volume, filePath string, algo BitrotAlgorithm, tillOffset int64, sum []byte) *wholeBitrotReader {
	return &wholeBitrotReader{
		disk:       disk,
		volume:     volume,
		filePath:   filePath,
		verifier:   &BitrotVerifier{algo, sum},
		tillOffset: tillOffset,
		buf:        nil,
	}

 * limitations under the License.
 */

package com.google.common.collect;

import java.util.Set;

/**
 * GWT emulation of {@link ImmutableEnumSet}. The type parameter is not bounded by {@code Enum<E>}
 * to avoid code-size bloat.
 *
 * @author Hayward Chan
 */
final class ImmutableEnumSet<E> extends ForwardingImmutableSet<E> {
  static <E> ImmutableSet<E> asImmutable(Set<E> delegate) {

/**
 * Optional features of classes derived from {@code List}.
 *
 * @author George van den Driessche
 */
@SuppressWarnings("rawtypes") // maybe avoidable if we rework the whole package?
@GwtCompatible
public enum ListFeature implements Feature<List> {
  SUPPORTS_SET,
  SUPPORTS_ADD_WITH_INDEX(CollectionFeature.SUPPORTS_ADD),
  SUPPORTS_REMOVE_WITH_INDEX(CollectionFeature.SUPPORTS_REMOVE),

  GENERAL_PURPOSE(

/**
 * Optional features of classes derived from {@code Multimap}.
 *
 * @author Louis Wasserman
 */
@SuppressWarnings("rawtypes") // maybe avoidable if we rework the whole package?
@GwtCompatible
public enum MultimapFeature implements Feature<Multimap> {
  VALUE_COLLECTIONS_SUPPORT_ITERATOR_REMOVE;

  private final Set<Feature<? super Multimap>> implied;

  MultimapFeature(Feature<? super Multimap>... implied) {

@Documented
@Retention(RetentionPolicy.RUNTIME)
@Target(ElementType.TYPE)
@Inherited
public @interface After {

    /**
     * Type of pointer.
     * @see org.apache.maven.api.Lifecycle.Pointer.Type
     */
    enum Type {
        PROJECT,
        DEPENDENCIES,
        CHILDREN
    }

    /**
     * The phase name.
     */
    String phase();

    /**
     * The type of this pointer.
     */