diff --git a/MdePkg/Include/IndustryStandard/Udf.h b/MdePkg/Include/IndustryStandard/Udf.h
index 0febb4bcda..5806560aee 100644
--- a/MdePkg/Include/IndustryStandard/Udf.h
+++ b/MdePkg/Include/IndustryStandard/Udf.h
@@ -24,11 +24,22 @@
 #define UDF_LOGICAL_SECTOR_SIZE   ((UINT64)(1ULL << UDF_LOGICAL_SECTOR_SHIFT))
 #define UDF_VRS_START_OFFSET      ((UINT64)(16ULL << UDF_LOGICAL_SECTOR_SHIFT))
 
-#define _GET_TAG_ID(_Pointer) \
-  (((UDF_DESCRIPTOR_TAG *)(_Pointer))->TagIdentifier)
-
-#define IS_AVDP(_Pointer) \
-  ((BOOLEAN)(_GET_TAG_ID (_Pointer) == 2))
+typedef enum {
+  UdfPrimaryVolumeDescriptor = 1,
+  UdfAnchorVolumeDescriptorPointer = 2,
+  UdfVolumeDescriptorPointer = 3,
+  UdfImplemenationUseVolumeDescriptor = 4,
+  UdfPartitionDescriptor = 5,
+  UdfLogicalVolumeDescriptor = 6,
+  UdfUnallocatedSpaceDescriptor = 7,
+  UdfTerminatingDescriptor = 8,
+  UdfLogicalVolumeIntegrityDescriptor = 9,
+  UdfFileSetDescriptor = 256,
+  UdfFileIdentifierDescriptor = 257,
+  UdfAllocationExtentDescriptor = 258,
+  UdfFileEntry = 261,
+  UdfExtendedFileEntry = 266,
+} UDF_VOLUME_DESCRIPTOR_ID;
 
 #pragma pack(1)
 
@@ -48,6 +59,66 @@ typedef struct {
   UINT32  ExtentLocation;
 } UDF_EXTENT_AD;
 
+typedef struct {
+  UINT8           CharacterSetType;
+  UINT8           CharacterSetInfo[63];
+} UDF_CHAR_SPEC;
+
+typedef struct {
+  UINT8           Flags;
+  UINT8           Identifier[23];
+  union {
+    //
+    // Domain Entity Identifier
+    //
+    struct {
+      UINT16      UdfRevision;
+      UINT8       DomainFlags;
+      UINT8       Reserved[5];
+    } Domain;
+    //
+    // UDF Entity Identifier
+    //
+    struct {
+      UINT16      UdfRevision;
+      UINT8       OSClass;
+      UINT8       OSIdentifier;
+      UINT8       Reserved[4];
+    } Entity;
+    //
+    // Implementation Entity Identifier
+    //
+    struct {
+      UINT8       OSClass;
+      UINT8       OSIdentifier;
+      UINT8       ImplementationUseArea[6];
+    } ImplementationEntity;
+    //
+    // Application Entity Identifier
+    //
+    struct {
+      UINT8       ApplicationUseArea[8];
+    } ApplicationEntity;
+    //
+    // Raw Identifier Suffix
+    //
+    struct {
+      UINT8       Data[8];
+    } Raw;
+  } Suffix;
+} UDF_ENTITY_ID;
+
+typedef struct {
+  UINT32        LogicalBlockNumber;
+  UINT16        PartitionReferenceNumber;
+} UDF_LB_ADDR;
+
+typedef struct {
+  UINT32                           ExtentLength;
+  UDF_LB_ADDR                      ExtentLocation;
+  UINT8                            ImplementationUse[6];
+} UDF_LONG_ALLOCATION_DESCRIPTOR;
+
 typedef struct {
   UDF_DESCRIPTOR_TAG  DescriptorTag;
   UDF_EXTENT_AD       MainVolumeDescriptorSequenceExtent;
@@ -55,6 +126,22 @@ typedef struct {
   UINT8               Reserved[480];
 } UDF_ANCHOR_VOLUME_DESCRIPTOR_POINTER;
 
+typedef struct {
+  UDF_DESCRIPTOR_TAG              DescriptorTag;
+  UINT32                          VolumeDescriptorSequenceNumber;
+  UDF_CHAR_SPEC                   DescriptorCharacterSet;
+  UINT8                           LogicalVolumeIdentifier[128];
+  UINT32                          LogicalBlockSize;
+  UDF_ENTITY_ID                   DomainIdentifier;
+  UDF_LONG_ALLOCATION_DESCRIPTOR  LogicalVolumeContentsUse;
+  UINT32                          MapTableLength;
+  UINT32                          NumberOfPartitionMaps;
+  UDF_ENTITY_ID                   ImplementationIdentifier;
+  UINT8                           ImplementationUse[128];
+  UDF_EXTENT_AD                   IntegritySequenceExtent;
+  UINT8                           PartitionMaps[6];
+} UDF_LOGICAL_VOLUME_DESCRIPTOR;
+
 #pragma pack()
 
 #endif