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+// © 2022 and later: Unicode, Inc. and others.
+// License & terms of use: http://www.unicode.org/copyright.html
+
+#ifndef __UDISPLAYOPTIONS_H__
+#define __UDISPLAYOPTIONS_H__
+
+#include "unicode/utypes.h"
+
+#if !UCONFIG_NO_FORMATTING
+
+/**
+ * \file
+ * \brief C API: Display options (enum types, values, helper functions)
+ *
+ * These display options are designed to be used in class DisplayOptions
+ * as a more modern version of the UDisplayContext mechanism.
+ */
+
+#include "unicode/uversion.h"
+
+#ifndef U_HIDE_DRAFT_API
+
+/**
+ * Represents all the grammatical cases that are supported by CLDR.
+ *
+ * @draft ICU 72
+ */
+typedef enum UDisplayOptionsGrammaticalCase {
+    /**
+     * A possible setting for GrammaticalCase.
+     * The grammatical case context to be used is unknown (this is the default value).
+     * @draft ICU 72
+     */
+    UDISPOPT_GRAMMATICAL_CASE_UNDEFINED = 0,
+    /** @draft ICU 72 */
+    UDISPOPT_GRAMMATICAL_CASE_ABLATIVE = 1,
+    /** @draft ICU 72 */
+    UDISPOPT_GRAMMATICAL_CASE_ACCUSATIVE = 2,
+    /** @draft ICU 72 */
+    UDISPOPT_GRAMMATICAL_CASE_COMITATIVE = 3,
+    /** @draft ICU 72 */
+    UDISPOPT_GRAMMATICAL_CASE_DATIVE = 4,
+    /** @draft ICU 72 */
+    UDISPOPT_GRAMMATICAL_CASE_ERGATIVE = 5,
+    /** @draft ICU 72 */
+    UDISPOPT_GRAMMATICAL_CASE_GENITIVE = 6,
+    /** @draft ICU 72 */
+    UDISPOPT_GRAMMATICAL_CASE_INSTRUMENTAL = 7,
+    /** @draft ICU 72 */
+    UDISPOPT_GRAMMATICAL_CASE_LOCATIVE = 8,
+    /** @draft ICU 72 */
+    UDISPOPT_GRAMMATICAL_CASE_LOCATIVE_COPULATIVE = 9,
+    /** @draft ICU 72 */
+    UDISPOPT_GRAMMATICAL_CASE_NOMINATIVE = 10,
+    /** @draft ICU 72 */
+    UDISPOPT_GRAMMATICAL_CASE_OBLIQUE = 11,
+    /** @draft ICU 72 */
+    UDISPOPT_GRAMMATICAL_CASE_PREPOSITIONAL = 12,
+    /** @draft ICU 72 */
+    UDISPOPT_GRAMMATICAL_CASE_SOCIATIVE = 13,
+    /** @draft ICU 72 */
+    UDISPOPT_GRAMMATICAL_CASE_VOCATIVE = 14,
+} UDisplayOptionsGrammaticalCase;
+
+/**
+ * @param grammaticalCase The grammatical case.
+ * @return the lowercase CLDR keyword string for the grammatical case.
+ *
+ * @draft ICU 72
+ */
+U_CAPI const char * U_EXPORT2
+udispopt_getGrammaticalCaseIdentifier(UDisplayOptionsGrammaticalCase grammaticalCase);
+
+/**
+ * @param identifier in lower case such as "dative" or "nominative"
+ * @return the plural category corresponding to the identifier, or `UDISPOPT_GRAMMATICAL_CASE_UNDEFINED`
+ *
+ * @draft ICU 72
+ */
+U_CAPI UDisplayOptionsGrammaticalCase U_EXPORT2
+udispopt_fromGrammaticalCaseIdentifier(const char *identifier);
+
+/**
+ * Standard CLDR plural form/category constants.
+ * See https://www.unicode.org/reports/tr35/tr35-numbers.html#Language_Plural_Rules
+ *
+ * @draft ICU 72
+ */
+typedef enum UDisplayOptionsPluralCategory {
+
+    /**
+     * A possible setting for PluralCategory.
+     * The plural category case context to be used is unknown (this is the default value).
+     *
+     * @draft ICU 72
+     */
+    UDISPOPT_PLURAL_CATEGORY_UNDEFINED = 0,
+    /** @draft ICU 72 */
+    UDISPOPT_PLURAL_CATEGORY_ZERO = 1,
+    /** @draft ICU 72 */
+    UDISPOPT_PLURAL_CATEGORY_ONE = 2,
+    /** @draft ICU 72 */
+    UDISPOPT_PLURAL_CATEGORY_TWO = 3,
+    /** @draft ICU 72 */
+    UDISPOPT_PLURAL_CATEGORY_FEW = 4,
+    /** @draft ICU 72 */
+    UDISPOPT_PLURAL_CATEGORY_MANY = 5,
+    /** @draft ICU 72 */
+    UDISPOPT_PLURAL_CATEGORY_OTHER = 6,
+} UDisplayOptionsPluralCategory;
+
+/**
+ * @param pluralCategory The plural category.
+ * @return the lowercase CLDR identifier string for the plural category.
+ *
+ * @draft ICU 72
+ */
+U_CAPI const char * U_EXPORT2
+udispopt_getPluralCategoryIdentifier(UDisplayOptionsPluralCategory pluralCategory);
+
+/**
+ * @param identifier for example "few" or "other"
+ * @return the plural category corresponding to the identifier (plural keyword),
+ *         or `UDISPOPT_PLURAL_CATEGORY_UNDEFINED`
+ *
+ * @draft ICU 72
+ */
+U_CAPI UDisplayOptionsPluralCategory U_EXPORT2
+udispopt_fromPluralCategoryIdentifier(const char *identifier);
+
+/**
+ * Represents all the grammatical noun classes that are supported by CLDR.
+ *
+ * @draft ICU 72.
+ */
+typedef enum UDisplayOptionsNounClass {
+    /**
+     * A possible setting for NounClass.
+     * The noun class case context to be used is unknown (this is the default value).
+     *
+     * @draft ICU 72
+     */
+    UDISPOPT_NOUN_CLASS_UNDEFINED = 0,
+    /** ICU 72 */
+    UDISPOPT_NOUN_CLASS_OTHER = 1,
+    /** ICU 72 */
+    UDISPOPT_NOUN_CLASS_NEUTER = 2,
+    /** ICU 72 */
+    UDISPOPT_NOUN_CLASS_FEMININE = 3,
+    /** ICU 72 */
+    UDISPOPT_NOUN_CLASS_MASCULINE = 4,
+    /** ICU 72 */
+    UDISPOPT_NOUN_CLASS_ANIMATE = 5,
+    /** ICU 72 */
+    UDISPOPT_NOUN_CLASS_INANIMATE = 6,
+    /** ICU 72 */
+    UDISPOPT_NOUN_CLASS_PERSONAL = 7,
+    /** ICU 72 */
+    UDISPOPT_NOUN_CLASS_COMMON = 8,
+} UDisplayOptionsNounClass;
+
+/**
+ * @param nounClass The noun class.
+ * @return the lowercase CLDR keyword string for the noun class.
+ *
+ * @draft ICU 72
+ */
+U_CAPI const char * U_EXPORT2
+udispopt_getNounClassIdentifier(UDisplayOptionsNounClass nounClass);
+
+/**
+ * @param identifier in lower case such as "feminine" or "masculine"
+ * @return the plural category corresponding to the identifier, or `UDISPOPT_NOUN_CLASS_UNDEFINED`
+ *
+ * @draft ICU 72
+ */
+U_CAPI UDisplayOptionsNounClass U_EXPORT2
+udispopt_fromNounClassIdentifier(const char *identifier);
+
+/**
+ * Represents all the capitalization options.
+ *
+ * @draft ICU 72
+ */
+typedef enum UDisplayOptionsCapitalization {
+    /**
+     * A possible setting for Capitalization.
+     * The capitalization context to be used is unknown (this is the default value).
+     *
+     * @draft ICU 72
+     */
+    UDISPOPT_CAPITALIZATION_UNDEFINED = 0,
+
+    /**
+     * The capitalization context if a date, date symbol or display name is to be
+     * formatted with capitalization appropriate for the beginning of a sentence.
+     *
+     * @draft ICU 72
+     */
+    UDISPOPT_CAPITALIZATION_BEGINNING_OF_SENTENCE = 1,
+
+    /**
+     * The capitalization context if a date, date symbol or display name is to be
+     * formatted with capitalization appropriate for the middle of a sentence.
+     *
+     * @draft ICU 72
+     */
+    UDISPOPT_CAPITALIZATION_MIDDLE_OF_SENTENCE = 2,
+
+    /**
+     * The capitalization context if a date, date symbol or display name is to be
+     * formatted with capitalization appropriate for stand-alone usage such as an
+     * isolated name on a calendar page.
+     *
+     * @draft ICU 72
+     */
+    UDISPOPT_CAPITALIZATION_STANDALONE = 3,
+
+    /**
+     * The capitalization context if a date, date symbol or display name is to be
+     * formatted with capitalization appropriate for a user-interface list or menu item.
+     *
+     * @draft ICU 72
+     */
+    UDISPOPT_CAPITALIZATION_UI_LIST_OR_MENU = 4,
+} UDisplayOptionsCapitalization;
+
+/**
+ * Represents all the dialect handlings.
+ *
+ * @draft ICU 72
+ */
+typedef enum UDisplayOptionsNameStyle {
+    /**
+     * A possible setting for NameStyle.
+     * The NameStyle context to be used is unknown (this is the default value).
+     *
+     * @draft ICU 72
+     */
+    UDISPOPT_NAME_STYLE_UNDEFINED = 0,
+
+    /**
+     * Use standard names when generating a locale name,
+     * e.g. en_GB displays as 'English (United Kingdom)'.
+     *
+     * @draft ICU 72
+     */
+    UDISPOPT_NAME_STYLE_STANDARD_NAMES = 1,
+
+    /**
+     * Use dialect names, when generating a locale name,
+     * e.g. en_GB displays as 'British English'.
+     *
+     * @draft ICU 72
+     */
+    UDISPOPT_NAME_STYLE_DIALECT_NAMES = 2,
+} UDisplayOptionsNameStyle;
+
+/**
+ * Represents all the display lengths.
+ *
+ * @draft ICU 72
+ */
+typedef enum UDisplayOptionsDisplayLength {
+    /**
+     * A possible setting for DisplayLength.
+     * The DisplayLength context to be used is unknown (this is the default value).
+     *
+     * @draft ICU 72
+     */
+    UDISPOPT_DISPLAY_LENGTH_UNDEFINED = 0,
+
+    /**
+     * Uses full names when generating a locale name,
+     * e.g. "United States" for US.
+     *
+     * @draft ICU 72
+     */
+    UDISPOPT_DISPLAY_LENGTH_FULL = 1,
+
+    /**
+     * Use short names when generating a locale name,
+     * e.g. "U.S." for US.
+     *
+     * @draft ICU 72
+     */
+    UDISPOPT_DISPLAY_LENGTH_SHORT = 2,
+} UDisplayOptionsDisplayLength;
+
+/**
+ * Represents all the substitute handling.
+ *
+ * @draft ICU 72
+ */
+typedef enum UDisplayOptionsSubstituteHandling {
+
+    /**
+     * A possible setting for SubstituteHandling.
+     * The SubstituteHandling context to be used is unknown (this is the default value).
+     *
+     * @draft ICU 72
+     */
+    UDISPOPT_SUBSTITUTE_HANDLING_UNDEFINED = 0,
+
+    /**
+     * Returns a fallback value (e.g., the input code) when no data is available.
+     * This is the default behaviour.
+     *
+     * @draft ICU 72
+     */
+    UDISPOPT_SUBSTITUTE_HANDLING_SUBSTITUTE = 1,
+
+    /**
+     * Returns a null value when no data is available.
+     *
+     * @draft ICU 72
+     */
+    UDISPOPT_SUBSTITUTE_HANDLING_NO_SUBSTITUTE = 2,
+} UDisplayOptionsSubstituteHandling;
+
+#endif // U_HIDE_DRAFT_API
+
+#endif /* #if !UCONFIG_NO_FORMATTING */
+
+#endif // __UDISPLAYOPTIONS_H__