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diff --git a/EdkCompatibilityPkg/Compatibility/Include/Library/LanguageLib.h b/EdkCompatibilityPkg/Compatibility/Include/Library/LanguageLib.h
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+/** @file
+  Provides functions for language conversion between ISO 639-2 and RFC 4646 styles.
+
+Copyright (c) 2009, Intel Corporation<BR>
+All rights reserved. This program and the accompanying materials
+are licensed and made available under the terms and conditions of the BSD License
+which accompanies this distribution.  The full text of the license may be found at
+http://opensource.org/licenses/bsd-license.php
+
+THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+
+**/
+
+#ifndef __LANGUAGE_LIB__
+#define __LANGUAGE_LIB__
+
+/**
+  Convert an ISO 639-2 language code to a RFC 4646 language code.
+  If the ISO 639-2 language code has a corresponding ISO 639-1 code, then the ISO 639-1
+  code is returned. Else the original ISO 639-2 code is returned. The returned RFC 4646
+  language code is composed of only a primary language subtag.
+
+  If Iso639Language is NULL, then ASSERT.
+  If Rfc4646Language is NULL, then ASSERT.
+
+  @param[out] Rfc4646Language  Pointers to a buffer large enough for an ASCII string
+                               which reprsents a RFC 4646 language code containging only
+                               either a ISO 639-1 or ISO 639-2 primary language subtag.
+                               This string is Null-terminated.
+  @param[in]  Iso639Language   Pointer to a 3-letter ASCII string which represents
+                               an ISO 639-2 language code. This string is not required
+                               to be Null-terminated.
+
+  @retval TRUE                 The ISO 639-2 language code was converted to a ISO 639-1 code.
+  @retval FALSE                The language code does not have corresponding ISO 639-1 code.
+
+**/
+BOOLEAN
+EFIAPI
+ConvertIso639ToRfc4646 (
+  OUT CHAR8        *Rfc4646Language,
+  IN  CONST CHAR8  *Iso639Language
+  );
+
+/**
+  Convert a RFC 4646 language code to an ISO 639-2 language code. The primary language
+  subtag of the RFC 4646 code must be either an ISO 639-1 or 639-2 code. If the primary
+  language subtag is an ISO 639-1 code, then it is converted to its corresponding ISO 639-2
+  code (T code if applies). Else the ISO 639-2 code is returned.
+
+  If Rfc4646Language is NULL, then ASSERT.
+  If Iso639Language is NULL, then ASSERT.
+
+  @param[out] Iso639Language   Pointers to a buffer large enough for a 3-letter ASCII string
+                               which reprsents an ISO 639-2 language code. The string is Null-terminated.
+  @param[in]  Rfc4646Language  Pointer to a RFC 4646 language code string. This string is terminated
+                               by a NULL or a ';' character.
+
+  @retval TRUE                 Language code converted successfully.
+  @retval FALSE                The RFC 4646 language code is invalid or unsupported.
+
+**/
+BOOLEAN
+EFIAPI
+ConvertRfc4646ToIso639 (
+  OUT CHAR8        *Iso639Language,
+  IN  CONST CHAR8  *Rfc4646Language
+  );
+
+/**
+  Convert ISO 639-2 language codes to RFC 4646 codes and return the converted codes.
+  Caller is responsible for freeing the allocated buffer.
+
+  If Iso639Languages is NULL, then ASSERT.
+
+  @param[in] Iso639Languages  Pointers to a Null-terminated ISO 639-2 language codes string containing
+                              one or more ISO 639-2 3-letter language codes.
+  
+  @retval NULL                Invalid ISO 639-2 language code found.
+  @retval NULL                Out of memory.
+  @retval !NULL               Pointer to the allocate buffer containing the Null-terminated converted language codes string.
+                              This string is composed of one or more RFC4646 language codes each of which has only
+                              ISO 639-1 2-letter primary language subtag.
+
+**/
+CHAR8 *
+EFIAPI
+ConvertLanguagesIso639ToRfc4646 (
+  IN CONST CHAR8  *Iso639Languages
+  );
+
+/**
+  Convert RFC 4646 language codes to ISO 639-2 codes and return the converted codes.
+  The primary language subtag of the RFC 4646 code must be either an ISO 639-1 or 639-2 code.
+  Caller is responsible for freeing the allocated buffer.
+
+  If Rfc4646Languages is NULL, then ASSERT.
+
+  @param[in] Rfc4646Languages  Pointers to a Null-terminated RFC 4646 language codes string containing
+                               one or more RFC 4646 language codes.
+  
+  @retval NULL                 Invalid or unsupported RFC 4646 language code found.
+  @retval NULL                 Out of memory.
+  @retval !NULL                Pointer to the allocate buffer containing the Null-terminated converted language codes string.
+                               This string is composed of one or more ISO 639-2 language codes.
+
+**/
+CHAR8 *
+EFIAPI
+ConvertLanguagesRfc4646ToIso639 (
+  IN CONST CHAR8  *Rfc4646Languages
+  );
+
+
+#endif