diff --git a/Package.resolved b/Package.resolved
index 0dd8151..47c3743 100644
--- a/Package.resolved
+++ b/Package.resolved
@@ -7,7 +7,7 @@
       "location" : "https://github.com/OpenSwiftUIProject/DarwinPrivateFrameworks.git",
       "state" : {
         "branch" : "main",
-        "revision" : "d0ac1385d31428f84add080d9235ed08ccc12b1d"
+        "revision" : "539681dd9bd257b311ae09f8e7266bb8fa710aca"
       }
     },
     {
diff --git a/Sources/OpenGraph/Attribute/Attribute/AnyAttribute.swift b/Sources/OpenGraph/Attribute/Attribute/AnyAttribute.swift
index 158a1ac..cba4296 100644
--- a/Sources/OpenGraph/Attribute/Attribute/AnyAttribute.swift
+++ b/Sources/OpenGraph/Attribute/Attribute/AnyAttribute.swift
@@ -46,7 +46,7 @@ extension AnyAttribute {
     }
 
     public func mutateBody<Value>(as type: Value.Type, invalidating: Bool, _ body: (inout Value) -> Void) {
-        AnyAttribute.mutateAttribute(self, type: OGTypeID(type), invalidating: invalidating) { value in
+        AnyAttribute.mutateAttribute(self, type: Metadata(type), invalidating: invalidating) { value in
             body(&value.assumingMemoryBound(to: Value.self).pointee)
         }
     }
@@ -92,7 +92,7 @@ extension AnyAttribute {
     @_silgen_name("OGGraphMutateAttribute")
     private static func mutateAttribute(
         _ attribute: AnyAttribute,
-        type: OGTypeID,
+        type: Metadata,
         invalidating: Bool,
         body: (UnsafeMutableRawPointer) -> Void
     )
diff --git a/Sources/OpenGraph/Attribute/Attribute/Attribute.swift b/Sources/OpenGraph/Attribute/Attribute/Attribute.swift
index c4d0bf0..229c9b9 100644
--- a/Sources/OpenGraph/Attribute/Attribute/Attribute.swift
+++ b/Sources/OpenGraph/Attribute/Attribute/Attribute.swift
@@ -51,7 +51,7 @@ public struct Attribute<Value> {
         let index = OGGraph.typeIndex(
             ctx: context,
             body: Body.self,
-            valueType: OGTypeID(Value.self),
+            valueType: Metadata(Value.self),
             flags: flags,
             update: update
         )
@@ -180,7 +180,7 @@ public struct Attribute<Value> {
     public func updateValue() { identifier.updateValue() }
     public func prefetchValue() { identifier.prefetchValue() }
     public func invalidateValue() { identifier.invalidateValue() }
-    public func validate() { identifier.verify(type: OGTypeID(Value.self)) }
+    public func validate() { identifier.verify(type: Metadata(Value.self)) }
 
     // MARK: - Input
     
diff --git a/Sources/OpenGraph/Attribute/Attribute/External.swift b/Sources/OpenGraph/Attribute/Attribute/External.swift
index a889852..417dda1 100644
--- a/Sources/OpenGraph/Attribute/Attribute/External.swift
+++ b/Sources/OpenGraph/Attribute/Attribute/External.swift
@@ -21,5 +21,5 @@ extension External: _AttributeBody {
 // MARK: CustomStringConvertible
 
 extension External: CustomStringConvertible {
-    public var description: String { OGTypeID(Value.self).description }
+    public var description: String { Metadata(Value.self).description }
 }
diff --git a/Sources/OpenGraph/Attribute/Attribute/Focus.swift b/Sources/OpenGraph/Attribute/Attribute/Focus.swift
index 810ddc8..c9f89bb 100644
--- a/Sources/OpenGraph/Attribute/Attribute/Focus.swift
+++ b/Sources/OpenGraph/Attribute/Attribute/Focus.swift
@@ -25,5 +25,5 @@ extension Focus: Rule {
 // MARK: CustomStringConvertible
 
 extension Focus: CustomStringConvertible {
-    public var description: String { "• \(OGTypeID(Value.self).description)" }
+    public var description: String { "• \(Metadata(Value.self).description)" }
 }
diff --git a/Sources/OpenGraph/Attribute/Rule/Rule.swift b/Sources/OpenGraph/Attribute/Rule/Rule.swift
index 9530d4e..067f792 100644
--- a/Sources/OpenGraph/Attribute/Rule/Rule.swift
+++ b/Sources/OpenGraph/Attribute/Rule/Rule.swift
@@ -73,7 +73,7 @@ extension Rule where Self: Hashable {
         owner: AnyAttribute?
     ) -> Value? {
         withUnsafePointer(to: self) { bodyPointer in
-            let value = __OGGraphReadCachedAttributeIfExists(hashValue, OGTypeID(Self.self), bodyPointer, OGTypeID(Value.self), options, owner ?? .nil, false)
+            let value = __OGGraphReadCachedAttributeIfExists(hashValue, Metadata(Self.self), bodyPointer, Metadata(Value.self), options, owner ?? .nil, false)
             guard let value else { return nil }
             return value.assumingMemoryBound(to: Value.self).pointee
         }
@@ -87,7 +87,7 @@ extension Rule where Self: Hashable {
         update: AttributeUpdateBlock
     ) -> UnsafePointer<Value> {
         // TODO: pass closure here
-        __OGGraphReadCachedAttribute(hashValue, OGTypeID(Self.self), bodyPtr, OGTypeID(Value.self), options, owner ?? .nil, false)
+        __OGGraphReadCachedAttribute(hashValue, Metadata(Self.self), bodyPtr, Metadata(Value.self), options, owner ?? .nil, false)
             .assumingMemoryBound(to: Value.self)
     }
 }
diff --git a/Sources/OpenGraph/Graph/OGGraph.swift b/Sources/OpenGraph/Graph/OGGraph.swift
index 24fc012..885acfd 100644
--- a/Sources/OpenGraph/Graph/OGGraph.swift
+++ b/Sources/OpenGraph/Graph/OGGraph.swift
@@ -11,7 +11,7 @@ extension OGGraph {
     public static func typeIndex(
         ctx: OGGraphContext,
         body: _AttributeBody.Type,
-        valueType: OGTypeID,
+        valueType: Metadata,
         flags: OGAttributeTypeFlags,
         update: AttributeUpdateBlock
     ) -> Int {
diff --git a/Sources/OpenGraph/Graph/OGSubgraph.swift b/Sources/OpenGraph/Graph/OGSubgraph.swift
index c6284ba..098a5d7 100644
--- a/Sources/OpenGraph/Graph/OGSubgraph.swift
+++ b/Sources/OpenGraph/Graph/OGSubgraph.swift
@@ -35,13 +35,13 @@ extension OGSubgraph {
 extension OGSubgraph {
     public static func beginTreeElement<Value>(value: Attribute<Value>, flags: UInt32) {
         if shouldRecordTree {
-            __OGSubgraphBeginTreeElement(value.identifier, OGTypeID(Value.self), flags)
+            __OGSubgraphBeginTreeElement(value.identifier, Metadata(Value.self), flags)
         }
     }
     
     public static func addTreeValue<Value>(_ value: Attribute<Value>, forKey key: UnsafePointer<Int8>, flags: UInt32) {
         if shouldRecordTree {
-            __OGSubgraphAddTreeValue(value.identifier, OGTypeID(Value.self), key, flags)
+            __OGSubgraphAddTreeValue(value.identifier, Metadata(Value.self), key, flags)
         }
     }
     
diff --git a/Sources/OpenGraph/Runtime/OGTypeID.swift b/Sources/OpenGraph/Runtime/Metadata.swift
similarity index 94%
rename from Sources/OpenGraph/Runtime/OGTypeID.swift
rename to Sources/OpenGraph/Runtime/Metadata.swift
index af6621e..7ff2201 100644
--- a/Sources/OpenGraph/Runtime/OGTypeID.swift
+++ b/Sources/OpenGraph/Runtime/Metadata.swift
@@ -1,5 +1,5 @@
 //
-//  OGTypeID.swift
+//  Metadata.swift
 //  OpenGraph
 //
 //  Audited for RELEASE_2021
@@ -23,7 +23,7 @@ public func OGTypeApplyFields2(
     body: (UnsafePointer<Int8>, Int, Any.Type) -> Bool
 ) -> Bool
 
-extension OGTypeID: Swift.Hashable, Swift.CustomStringConvertible {
+extension Metadata: Swift.Hashable, Swift.CustomStringConvertible {
     @inlinable
     @inline(__always)
     public init(_ type: Any.Type) {
diff --git a/Sources/OpenGraph/Runtime/OGTupleType.swift b/Sources/OpenGraph/Runtime/OGTupleType.swift
index 8116d34..ed07c5b 100644
--- a/Sources/OpenGraph/Runtime/OGTupleType.swift
+++ b/Sources/OpenGraph/Runtime/OGTupleType.swift
@@ -8,7 +8,7 @@ public import OpenGraph_SPI
 
 @_silgen_name("OGTupleElementType")
 @inline(__always)
-private func OGTupleElementType(_ tupleType: OGTupleType, index: Int) -> OGTypeID
+private func OGTupleElementType(_ tupleType: OGTupleType, index: Int) -> Metadata
 
 // TODO
 extension OGTupleType {
diff --git a/Sources/OpenGraphShims/GraphShims.swift b/Sources/OpenGraphShims/GraphShims.swift
index a3f4bf4..6605bb8 100644
--- a/Sources/OpenGraphShims/GraphShims.swift
+++ b/Sources/OpenGraphShims/GraphShims.swift
@@ -22,7 +22,6 @@ public typealias OGSwiftMetadata = AGSwiftMetadata
 public typealias OGTupleType = AGTupleType
 public typealias OGTypeApplyOptions = AGTypeApplyOptions
 public typealias OGTypeKind = AGTypeKind
-public typealias OGTypeID = AGTypeID
 public typealias OGUniqueID = AGUniqueID
 public typealias OGValue = AGValue
 public typealias OGValueOptions = AGValueOptions
diff --git a/Sources/OpenGraphShims/OGTypeID+Debug.swift b/Sources/OpenGraphShims/Metadata+Debug.swift
similarity index 91%
rename from Sources/OpenGraphShims/OGTypeID+Debug.swift
rename to Sources/OpenGraphShims/Metadata+Debug.swift
index bac11cb..7afdb45 100644
--- a/Sources/OpenGraphShims/OGTypeID+Debug.swift
+++ b/Sources/OpenGraphShims/Metadata+Debug.swift
@@ -1,10 +1,10 @@
 //
-//  OGTypeID+Debug.swift
+//  Metadata+Debug.swift
 
 import Foundation
 
 @_spi(Debug)
-extension OGTypeID {
+extension Metadata {
     public struct Option {
         let maxLevel: Int
         let ignoreStdlib: Bool
@@ -45,7 +45,7 @@ extension OGTypeID {
                 let fieldName = String(cString: name)
                 write(&result, string: "case \(fieldName)(\(type)) // offset = \(offset.hex)", level: level+1)
                 if recursive {
-                    OGTypeID(type)._layoutDescription(&result, recursive: true, level: level+1)
+                    Metadata(type)._layoutDescription(&result, recursive: true, level: level+1)
                 }
                 return true
             }
@@ -55,7 +55,7 @@ extension OGTypeID {
                 let fieldName = String(cString: name)
                 write(&result, string: "case \(fieldName)(\(type)) // offset = \(offset.hex)", level: level+1)
                 if recursive {
-                    OGTypeID(type)._layoutDescription(&result, recursive: true, level: level+1)
+                    Metadata(type)._layoutDescription(&result, recursive: true, level: level+1)
                 }
                 return true
             }
@@ -65,7 +65,7 @@ extension OGTypeID {
                 let fieldName = String(cString: name)
                 write(&result, string: "var \(fieldName): \(type) // offset = \(offset.hex)", level: level+1)
                 if recursive {
-                    OGTypeID(type)._layoutDescription(&result, recursive: true, level: level+1)
+                    Metadata(type)._layoutDescription(&result, recursive: true, level: level+1)
                 }
                 return true
             }
@@ -78,7 +78,7 @@ extension OGTypeID {
                 
                 write(&result, string: "var \(fieldName): \(type) // offset = \(offset.hex)", level: level+1)
                 if recursive {
-                    OGTypeID(type)._layoutDescription(&result, recursive: true, level: level+1)
+                    Metadata(type)._layoutDescription(&result, recursive: true, level: level+1)
                 }
                 return true
             }
diff --git a/Sources/OpenGraph_SPI/Runtime/OGSwiftMetadata.h b/Sources/OpenGraph_SPI/Runtime/OGSwiftMetadata.h
index 7fcc697..860995d 100644
--- a/Sources/OpenGraph_SPI/Runtime/OGSwiftMetadata.h
+++ b/Sources/OpenGraph_SPI/Runtime/OGSwiftMetadata.h
@@ -1,9 +1,6 @@
 //
 //  OGSwiftMetadata.h
-//
-//
-//  Created by Kyle on 2024/1/8.
-//
+//  OpenGraph_SPI
 
 #ifndef OGSwiftMetadata_h
 #define OGSwiftMetadata_h
diff --git a/Sources/OpenGraph_SPI/Runtime/OGTypeID.h b/Sources/OpenGraph_SPI/Runtime/OGTypeID.h
index 2e2fc72..702c604 100644
--- a/Sources/OpenGraph_SPI/Runtime/OGTypeID.h
+++ b/Sources/OpenGraph_SPI/Runtime/OGTypeID.h
@@ -12,7 +12,7 @@
 #include "OGSwiftMetadata.h"
 #include "OGTypeKind.h"
 
-typedef const OGSwiftMetadata *OGTypeID OG_SWIFT_STRUCT;
+typedef const OGSwiftMetadata *OGTypeID OG_SWIFT_STRUCT OG_SWIFT_NAME(Metadata);
 
 OG_EXTERN_C_BEGIN
 
diff --git a/Tests/OpenGraphCompatibilityTests/GraphShims.swift b/Tests/OpenGraphCompatibilityTests/GraphShims.swift
index d59b1ce..7336ad5 100644
--- a/Tests/OpenGraphCompatibilityTests/GraphShims.swift
+++ b/Tests/OpenGraphCompatibilityTests/GraphShims.swift
@@ -25,7 +25,6 @@ public typealias OGSwiftMetadata = AGSwiftMetadata
 public typealias OGTupleType = AGTupleType
 public typealias OGTypeApplyOptions = AGTypeApplyOptions
 public typealias OGTypeKind = AGTypeKind
-public typealias OGTypeID = AGTypeID
 public typealias OGUniqueID = AGUniqueID
 public typealias OGValue = AGValue
 public typealias OGValueOptions = AGValueOptions
diff --git a/Tests/OpenGraphCompatibilityTests/Runtime/TypeIDTests.swift b/Tests/OpenGraphCompatibilityTests/Runtime/MetadataTests.swift
similarity index 73%
rename from Tests/OpenGraphCompatibilityTests/Runtime/TypeIDTests.swift
rename to Tests/OpenGraphCompatibilityTests/Runtime/MetadataTests.swift
index e1925d6..6a8a03c 100644
--- a/Tests/OpenGraphCompatibilityTests/Runtime/TypeIDTests.swift
+++ b/Tests/OpenGraphCompatibilityTests/Runtime/MetadataTests.swift
@@ -1,13 +1,21 @@
 //
-//  TypeIDTests.swift
-//
-//
-//
+//  MetadataTests.swift
+//  OpenGraphCompatibilityTests
 
 import Testing
 
-@Suite(.disabled(if: !compatibilityTestEnabled, "OGTypeID is not implemented"))
-struct TypeIDTests {
+@Suite(.disabled(if: !compatibilityTestEnabled, "Metadata is not implemented"))
+struct MetadataTests {
+    @Test
+    func descriptor() throws {
+        let n1 = try #require(Metadata(Int.self).nominalDescriptor)
+        let n2 = try #require(Metadata(String.self).nominalDescriptor)
+        let n3 = try #require(Metadata(Int.self).nominalDescriptor)
+        
+        #expect(n1 != n2)
+        #expect(n1 == n3)
+    }
+    
     class T1 {
         var a = 0
         var b: Double = 0
@@ -24,15 +32,15 @@ struct TypeIDTests {
     
     @Test
     func description() {
-        #expect(OGTypeID(T1.self).description == "TypeIDTests.T1")
-        #expect(OGTypeID(T2.self).description == "TypeIDTests.T2")
-        #expect(OGTypeID(T3.self).description == "TypeIDTests.T3")
+        #expect(Metadata(T1.self).description == "TypeIDTests.T1")
+        #expect(Metadata(T2.self).description == "TypeIDTests.T2")
+        #expect(Metadata(T3.self).description == "TypeIDTests.T3")
     }
     
     @Test
     func forEachField() throws {
         for options in [OGTypeApplyOptions._1] {
-            let result = OGTypeID(T1.self).forEachField(options: options) { name, offset, type in
+            let result = Metadata(T1.self).forEachField(options: options) { name, offset, type in
                 if offset == 16 {
                     #expect(type is Int.Type)
                     #expect(String(cString: name) == "a")
@@ -48,7 +56,7 @@ struct TypeIDTests {
             #expect(result == true)
         }
         for options in [OGTypeApplyOptions._2, ._4, []] {
-            let result = OGTypeID(T1.self).forEachField(options: options) { name, offset, type in
+            let result = Metadata(T1.self).forEachField(options: options) { name, offset, type in
                 if offset == 16 {
                     #expect(type is Int.Type)
                     #expect(String(cString: name) == "a")
@@ -64,7 +72,7 @@ struct TypeIDTests {
             #expect(result == false)
         }
         for options in [OGTypeApplyOptions._2, []] {
-            let result = OGTypeID(T2.self).forEachField(options: options) { name, offset, type in
+            let result = Metadata(T2.self).forEachField(options: options) { name, offset, type in
                 if offset == 0 {
                     #expect(type is Int.Type)
                     return true
@@ -78,7 +86,7 @@ struct TypeIDTests {
             #expect(result == true)
         }
         for options in [OGTypeApplyOptions._1, ._4] {
-            let result = OGTypeID(T2.self).forEachField(options: options) { name, offset, type in
+            let result = Metadata(T2.self).forEachField(options: options) { name, offset, type in
                 if offset == 0 {
                     #expect(type is Int.Type)
                     #expect(String(cString: name) == "a")
@@ -94,7 +102,7 @@ struct TypeIDTests {
             #expect(result == false)
         }
         for options in [OGTypeApplyOptions._1, ._2, ._4, []] {
-            let result = OGTypeID(T3.self).forEachField(options: options) { _, _, _ in
+            let result = Metadata(T3.self).forEachField(options: options) { _, _, _ in
                 true
             }
             #expect(result == false)
diff --git a/Tests/OpenGraphCompatibilityTests/Runtime/OGTypeIDTests.swift b/Tests/OpenGraphCompatibilityTests/Runtime/OGTypeIDTests.swift
deleted file mode 100644
index 969b52e..0000000
--- a/Tests/OpenGraphCompatibilityTests/Runtime/OGTypeIDTests.swift
+++ /dev/null
@@ -1,19 +0,0 @@
-//
-//  OGTypeIDTests.swift
-//  OpenGraphCompatibilityTests
-
-import Testing
-
-@Suite(.disabled(if: !compatibilityTestEnabled, "OGTypeID is not implemented"))
-struct OGTypeIDTests {
-
-    @Test
-    func descriptor() throws {
-        let n1 = try #require(OGTypeID(Int.self).nominalDescriptor)
-        let n2 = try #require(OGTypeID(String.self).nominalDescriptor)
-        let n3 = try #require(OGTypeID(Int.self).nominalDescriptor)
-        
-        #expect(n1 != n2)
-        #expect(n1 == n3)
-    }
-}
diff --git a/Tests/OpenGraphCompatibilityTests/Runtime/TypeKindTests.swift b/Tests/OpenGraphCompatibilityTests/Runtime/TypeKindTests.swift
index d18b0aa..3859721 100644
--- a/Tests/OpenGraphCompatibilityTests/Runtime/TypeKindTests.swift
+++ b/Tests/OpenGraphCompatibilityTests/Runtime/TypeKindTests.swift
@@ -8,7 +8,7 @@ import Testing
 
 private protocol P {}
 
-@Suite(.disabled(if: !compatibilityTestEnabled, "OGTypeID.kind is not implemented"))
+@Suite(.disabled(if: !compatibilityTestEnabled, "Metadata.kind is not implemented"))
 struct TypeKindTests {
     class T1 {}
     struct T2 {}
@@ -16,25 +16,25 @@ struct TypeKindTests {
     
     @Test
     func kindCases() throws {
-        #expect(OGTypeID(T1.self).kind == .class)
-        #expect(OGTypeID(T2.self).kind == .struct)
-        #expect(OGTypeID(T3.self).kind == .enum)
+        #expect(Metadata(T1.self).kind == .class)
+        #expect(Metadata(T2.self).kind == .struct)
+        #expect(Metadata(T3.self).kind == .enum)
         
-        #expect(OGTypeID(Void?.self).kind == .optional)
-        #expect(OGTypeID(Int?.self).kind == .optional)
-        #expect(OGTypeID(T1?.self).kind == .optional)
-        #expect(OGTypeID((T1, T2)?.self).kind == .optional)
+        #expect(Metadata(Void?.self).kind == .optional)
+        #expect(Metadata(Int?.self).kind == .optional)
+        #expect(Metadata(T1?.self).kind == .optional)
+        #expect(Metadata((T1, T2)?.self).kind == .optional)
 
-        #expect(OGTypeID(Void.self).kind == .tuple)
-        #expect(OGTypeID((Int, Double?).self).kind == .tuple)
-        #expect(OGTypeID((T1, T2, T3).self).kind == .tuple)
+        #expect(Metadata(Void.self).kind == .tuple)
+        #expect(Metadata((Int, Double?).self).kind == .tuple)
+        #expect(Metadata((T1, T2, T3).self).kind == .tuple)
         
-        #expect(OGTypeID((() -> Void).self).kind == .function)
+        #expect(Metadata((() -> Void).self).kind == .function)
         
-        #expect(OGTypeID(P.self).kind == .existential)
-        #expect(OGTypeID((any P).self).kind == .existential)
+        #expect(Metadata(P.self).kind == .existential)
+        #expect(Metadata((any P).self).kind == .existential)
         
-        #expect(OGTypeID(P.Protocol.self).kind == .metatype)
-        #expect(OGTypeID(type(of: Int.self)).kind == .metatype)
+        #expect(Metadata(P.Protocol.self).kind == .metatype)
+        #expect(Metadata(type(of: Int.self)).kind == .metatype)
     }
 }
diff --git a/Tests/OpenGraphShimsTests/OGTypeIDDebugTests.swift b/Tests/OpenGraphShimsTests/MetadataDebugTests.swift
similarity index 78%
rename from Tests/OpenGraphShimsTests/OGTypeIDDebugTests.swift
rename to Tests/OpenGraphShimsTests/MetadataDebugTests.swift
index 087bfff..6d8b067 100644
--- a/Tests/OpenGraphShimsTests/OGTypeIDDebugTests.swift
+++ b/Tests/OpenGraphShimsTests/MetadataDebugTests.swift
@@ -1,12 +1,12 @@
 //
-//  OGTypeIDDebugTests.swift
+//  MetadataDebugTests.swift
 //  OpenGraphTests
 
 @_spi(Debug) import OpenGraphShims
 import Testing
 
 @Suite(.disabled(if: !attributeGraphEnabled, "forEachField is not implemented for OG"))
-struct OGTypeIDDebugTests {
+struct MetadataDebugTests {
     struct Demo1 {
         var a: Int = .zero
         var b: Double = .zero
@@ -19,7 +19,7 @@ struct OGTypeIDDebugTests {
     
     @Test
     func layout() {
-        #expect(OGTypeID(Demo1.self).layoutDescription == #"""
+        #expect(Metadata(Demo1.self).layoutDescription == #"""
         struct Demo1 {
         \#tvar a: Int // offset = 0x0
         \#tvar b: Double // offset = 0x8
@@ -27,7 +27,7 @@ struct OGTypeIDDebugTests {
         
         """#)
         
-        #expect(OGTypeID(Demo2.self).layoutDescription == #"""
+        #expect(Metadata(Demo2.self).layoutDescription == #"""
         class Demo2 {
         \#tvar a: Int // offset = 0x10
         \#tvar b: Double // offset = 0x18