17 files changed, 270 insertions, 96 deletions

diff --git a/src/api/burn/WixToolset.BootstrapperCore.Native/inc/BootstrapperApplication.h b/src/api/burn/WixToolset.BootstrapperCore.Native/inc/BootstrapperApplication.h
index 943f5ead..fbbd10ee 100644
--- a/src/api/burn/WixToolset.BootstrapperCore.Native/inc/BootstrapperApplication.h
+++ b/src/api/burn/WixToolset.BootstrapperCore.Native/inc/BootstrapperApplication.h
@@ -226,6 +226,7 @@ enum BOOTSTRAPPER_APPLICATION_MESSAGE
     BOOTSTRAPPER_APPLICATION_MESSAGE_ONPLANRELATEDBUNDLETYPE,
     BOOTSTRAPPER_APPLICATION_MESSAGE_ONAPPLYDOWNGRADE,
     BOOTSTRAPPER_APPLICATION_MESSAGE_ONEXECUTEPROCESSCANCEL,
+    BOOTSTRAPPER_APPLICATION_MESSAGE_ONDETECTRELATEDBUNDLEPACKAGE,
 };
 
 enum BOOTSTRAPPER_APPLYCOMPLETE_ACTION
@@ -793,6 +794,22 @@ struct BA_ONDETECTRELATEDBUNDLE_RESULTS
     BOOL fCancel;
 };
 
+struct BA_ONDETECTRELATEDBUNDLEPACKAGE_ARGS
+{
+    DWORD cbSize;
+    LPCWSTR wzPackageId;
+    LPCWSTR wzBundleId;
+    BOOTSTRAPPER_RELATION_TYPE relationType;
+    BOOL fPerMachine;
+    LPCWSTR wzVersion;
+};
+
+struct BA_ONDETECTRELATEDBUNDLEPACKAGE_RESULTS
+{
+    DWORD cbSize;
+    BOOL fCancel;
+};
+
 struct BA_ONDETECTRELATEDMSIPACKAGE_ARGS
 {
     DWORD cbSize;
diff --git a/src/api/burn/WixToolset.Mba.Core/BootstrapperApplication.cs b/src/api/burn/WixToolset.Mba.Core/BootstrapperApplication.cs
index 5ed064fa..41738bf6 100644
--- a/src/api/burn/WixToolset.Mba.Core/BootstrapperApplication.cs
+++ b/src/api/burn/WixToolset.Mba.Core/BootstrapperApplication.cs
@@ -283,6 +283,9 @@ namespace WixToolset.Mba.Core
         /// <inheritdoc/>
         public event EventHandler<ExecuteProcessCancelEventArgs> ExecuteProcessCancel;
 
+        /// <inheritdoc/>
+        public event EventHandler<DetectRelatedBundlePackageEventArgs> DetectRelatedBundlePackage;
+
         /// <summary>
         /// Entry point that is called when the bootstrapper application is ready to run.
         /// </summary>
@@ -1385,6 +1388,19 @@ namespace WixToolset.Mba.Core
             }
         }
 
+        /// <summary>
+        /// Called by the engine, raises the <see cref="DetectRelatedBundlePackage"/> event.
+        /// </summary>
+        /// <param name="args">Additional arguments for this event.</param>
+        protected virtual void OnDetectRelatedBundlePackage(DetectRelatedBundlePackageEventArgs args)
+        {
+            EventHandler<DetectRelatedBundlePackageEventArgs> handler = this.DetectRelatedBundlePackage;
+            if (null != handler)
+            {
+                handler(this, args);
+            }
+        }
+
         #region IBootstrapperApplication Members
 
         int IBootstrapperApplication.BAProc(int message, IntPtr pvArgs, IntPtr pvResults, IntPtr pvContext)
@@ -2144,6 +2160,15 @@ namespace WixToolset.Mba.Core
             return args.HResult;
         }
 
+        int IBootstrapperApplication.OnDetectRelatedBundlePackage(string wzPackageId, string wzProductCode, RelationType relationType, bool fPerMachine, string wzVersion, ref bool fCancel)
+        {
+            DetectRelatedBundlePackageEventArgs args = new DetectRelatedBundlePackageEventArgs(wzPackageId, wzProductCode, relationType, fPerMachine, wzVersion, fCancel);
+            this.OnDetectRelatedBundlePackage(args);
+
+            fCancel = args.Cancel;
+            return args.HResult;
+        }
+
         #endregion
     }
 }
diff --git a/src/api/burn/WixToolset.Mba.Core/EventArgs.cs b/src/api/burn/WixToolset.Mba.Core/EventArgs.cs
index c2c73067..07b14b3d 100644
--- a/src/api/burn/WixToolset.Mba.Core/EventArgs.cs
+++ b/src/api/burn/WixToolset.Mba.Core/EventArgs.cs
@@ -2030,10 +2030,7 @@ namespace WixToolset.Mba.Core
     [Serializable]
     public class LaunchApprovedExeBeginEventArgs : CancellableHResultEventArgs
     {
-        /// <summary>
-        /// 
-        /// </summary>
-        /// <param name="cancelRecommendation"></param>
+        /// <summary />
         public LaunchApprovedExeBeginEventArgs(bool cancelRecommendation)
             : base(cancelRecommendation)
         {
@@ -2046,27 +2043,18 @@ namespace WixToolset.Mba.Core
     [Serializable]
     public class LaunchApprovedExeCompleteEventArgs : StatusEventArgs
     {
-        private int processId;
-
-        /// <summary>
-        /// 
-        /// </summary>
-        /// <param name="hrStatus"></param>
-        /// <param name="processId"></param>
+        /// <summary />
         public LaunchApprovedExeCompleteEventArgs(int hrStatus, int processId)
             : base(hrStatus)
         {
-            this.processId = processId;
+            this.ProcessId = processId;
         }
 
         /// <summary>
         /// Gets the ProcessId of the process that was launched.
         /// This is only valid if the status reports success.
         /// </summary>
-        public int ProcessId
-        {
-            get { return this.processId; }
-        }
+        public int ProcessId { get; private set; }
     }
 
     /// <summary>
@@ -2075,26 +2063,17 @@ namespace WixToolset.Mba.Core
     [Serializable]
     public class BeginMsiTransactionBeginEventArgs : CancellableHResultEventArgs
     {
-        private string transactionId;
-
-        /// <summary>
-        /// 
-        /// </summary>
-        /// <param name="transactionId"></param>
-        /// <param name="cancelRecommendation"></param>
+        /// <summary />
         public BeginMsiTransactionBeginEventArgs(string transactionId, bool cancelRecommendation)
             : base(cancelRecommendation)
         {
-            this.transactionId = transactionId;
+            this.TransactionId = transactionId;
         }
 
         /// <summary>
         /// Gets the MSI transaction Id.
         /// </summary>
-        public string TransactionId
-        {
-            get { return this.transactionId; }
-        }
+        public string TransactionId { get; private set; }
     }
 
     /// <summary>
@@ -2103,26 +2082,17 @@ namespace WixToolset.Mba.Core
     [Serializable]
     public class BeginMsiTransactionCompleteEventArgs : StatusEventArgs
     {
-        private string transactionId;
-
-        /// <summary>
-        /// 
-        /// </summary>
-        /// <param name="transactionId"></param>
-        /// <param name="hrStatus"></param>
+        /// <summary />
         public BeginMsiTransactionCompleteEventArgs(string transactionId, int hrStatus)
             : base(hrStatus)
         {
-            this.transactionId = transactionId;
+            this.TransactionId = transactionId;
         }
 
         /// <summary>
         /// Gets the MSI transaction Id.
         /// </summary>
-        public string TransactionId
-        {
-            get { return this.transactionId; }
-        }
+        public string TransactionId { get; private set; }
     }
 
     /// <summary>
@@ -2131,26 +2101,17 @@ namespace WixToolset.Mba.Core
     [Serializable]
     public class CommitMsiTransactionBeginEventArgs : CancellableHResultEventArgs
     {
-        private string transactionId;
-
-        /// <summary>
-        /// 
-        /// </summary>
-        /// <param name="transactionId"></param>
-        /// <param name="cancelRecommendation"></param>
+        /// <summary />
         public CommitMsiTransactionBeginEventArgs(string transactionId, bool cancelRecommendation)
             : base(cancelRecommendation)
         {
-            this.transactionId = transactionId;
+            this.TransactionId = transactionId;
         }
 
         /// <summary>
         /// Gets the MSI transaction Id.
         /// </summary>
-        public string TransactionId
-        {
-            get { return this.transactionId; }
-        }
+        public string TransactionId { get; private set; }
     }
 
     /// <summary>
@@ -2159,26 +2120,17 @@ namespace WixToolset.Mba.Core
     [Serializable]
     public class CommitMsiTransactionCompleteEventArgs : StatusEventArgs
     {
-        private string transactionId;
-
-        /// <summary>
-        /// 
-        /// </summary>
-        /// <param name="transactionId"></param>
-        /// <param name="hrStatus"></param>
+        /// <summary />
         public CommitMsiTransactionCompleteEventArgs(string transactionId, int hrStatus)
             : base(hrStatus)
         {
-            this.transactionId = transactionId;
+            this.TransactionId = transactionId;
         }
 
         /// <summary>
         /// Gets the MSI transaction Id.
         /// </summary>
-        public string TransactionId
-        {
-            get { return this.transactionId; }
-        }
+        public string TransactionId { get; private set; }
     }
 
     /// <summary>
@@ -2187,24 +2139,16 @@ namespace WixToolset.Mba.Core
     [Serializable]
     public class RollbackMsiTransactionBeginEventArgs : HResultEventArgs
     {
-        private string transactionId;
-
-        /// <summary>
-        /// 
-        /// </summary>
-        /// <param name="transactionId"></param>
+        /// <summary />
         public RollbackMsiTransactionBeginEventArgs(string transactionId)
         {
-            this.transactionId = transactionId;
+            this.TransactionId = transactionId;
         }
 
         /// <summary>
         /// Gets the MSI transaction Id.
         /// </summary>
-        public string TransactionId
-        {
-            get { return this.transactionId; }
-        }
+        public string TransactionId { get; private set; }
     }
 
     /// <summary>
@@ -2213,26 +2157,17 @@ namespace WixToolset.Mba.Core
     [Serializable]
     public class RollbackMsiTransactionCompleteEventArgs : StatusEventArgs
     {
-        private string transactionId;
-
-        /// <summary>
-        /// 
-        /// </summary>
-        /// <param name="transactionId"></param>
-        /// <param name="hrStatus"></param>
+        /// <summary />
         public RollbackMsiTransactionCompleteEventArgs(string transactionId, int hrStatus)
             : base(hrStatus)
         {
-            this.transactionId = transactionId;
+            this.TransactionId = transactionId;
         }
 
         /// <summary>
         /// Gets the MSI transaction Id.
         /// </summary>
-        public string TransactionId
-        {
-            get { return this.transactionId; }
-        }
+        public string TransactionId { get; private set; }
     }
 
     /// <summary>
@@ -2524,4 +2459,47 @@ namespace WixToolset.Mba.Core
         /// </summary>
         public BOOTSTRAPPER_EXECUTEPROCESSCANCEL_ACTION Action { get; set; }
     }
+
+    /// <summary>
+    /// Event arguments for <see cref="IDefaultBootstrapperApplication.DetectRelatedBundlePackage"/>
+    /// </summary>
+    [Serializable]
+    public class DetectRelatedBundlePackageEventArgs : CancellableHResultEventArgs
+    {
+        /// <summary />
+        public DetectRelatedBundlePackageEventArgs(string packageId, string productCode, RelationType relationType, bool perMachine, string version, bool cancelRecommendation)
+            : base(cancelRecommendation)
+        {
+            this.PackageId = packageId;
+            this.ProductCode = productCode;
+            this.RelationType = relationType;
+            this.PerMachine = perMachine;
+            this.Version = version;
+        }
+
+        /// <summary>
+        /// Gets the identity of the product's package detected.
+        /// </summary>
+        public string PackageId { get; private set; }
+
+        /// <summary>
+        /// Gets the identity of the related bundle detected.
+        /// </summary>
+        public string ProductCode { get; private set; }
+
+        /// <summary>
+        /// Gets the relationship type of the related bundle.
+        /// </summary>
+        public RelationType RelationType { get; private set; }
+
+        /// <summary>
+        /// Gets whether the detected bundle is per machine.
+        /// </summary>
+        public bool PerMachine { get; private set; }
+
+        /// <summary>
+        /// Gets the version of the related bundle detected.
+        /// </summary>
+        public string Version { get; private set; }
+    }
 }
diff --git a/src/api/burn/WixToolset.Mba.Core/IBootstrapperApplication.cs b/src/api/burn/WixToolset.Mba.Core/IBootstrapperApplication.cs
index 7cf0957a..ae642474 100644
--- a/src/api/burn/WixToolset.Mba.Core/IBootstrapperApplication.cs
+++ b/src/api/burn/WixToolset.Mba.Core/IBootstrapperApplication.cs
@@ -1182,6 +1182,20 @@ namespace WixToolset.Mba.Core
             [MarshalAs(UnmanagedType.I4)] BOOTSTRAPPER_EXECUTEPROCESSCANCEL_ACTION recommendation,
             [MarshalAs(UnmanagedType.I4)] ref BOOTSTRAPPER_EXECUTEPROCESSCANCEL_ACTION pAction
             );
+
+        /// <summary>
+        /// See <see cref="IDefaultBootstrapperApplication.DetectRelatedBundlePackage"/>.
+        /// </summary>
+        [PreserveSig]
+        [return: MarshalAs(UnmanagedType.I4)]
+        int OnDetectRelatedBundlePackage(
+            [MarshalAs(UnmanagedType.LPWStr)] string wzPackageId,
+            [MarshalAs(UnmanagedType.LPWStr)] string wzBundleId,
+            [MarshalAs(UnmanagedType.U4)] RelationType relationType,
+            [MarshalAs(UnmanagedType.Bool)] bool fPerMachine,
+            [MarshalAs(UnmanagedType.LPWStr)] string wzVersion,
+            [MarshalAs(UnmanagedType.Bool)] ref bool fCancel
+            );
     }
 
     /// <summary>
diff --git a/src/api/burn/WixToolset.Mba.Core/IDefaultBootstrapperApplication.cs b/src/api/burn/WixToolset.Mba.Core/IDefaultBootstrapperApplication.cs
index 21d99b32..77089e83 100644
--- a/src/api/burn/WixToolset.Mba.Core/IDefaultBootstrapperApplication.cs
+++ b/src/api/burn/WixToolset.Mba.Core/IDefaultBootstrapperApplication.cs
@@ -36,15 +36,15 @@ namespace WixToolset.Mba.Core
 
         /// <summary>
         /// Fired when the engine has begun acquiring the payload or container.
-        /// The BA can change the source using <see cref="IEngine.SetLocalSource(string, string, string)"/>
-        /// or <see cref="IEngine.SetDownloadSource(string, string, string, string, string)"/>.
+        /// The BA can change the source using <see cref="IEngine.SetLocalSource(String, String, String)"/>
+        /// or <see cref="IEngine.SetDownloadSource(String, String, String, String, String)"/>.
         /// </summary>
         event EventHandler<CacheAcquireBeginEventArgs> CacheAcquireBegin;
 
         /// <summary>
         /// Fired when the engine has completed the acquisition of the payload or container.
-        /// The BA can change the source using <see cref="IEngine.SetLocalSource(string, string, string)"/>
-        /// or <see cref="IEngine.SetDownloadSource(string, string, string, string, string)"/>.
+        /// The BA can change the source using <see cref="IEngine.SetLocalSource(String, String, String)"/>
+        /// or <see cref="IEngine.SetDownloadSource(String, String, String, String, String)"/>.
         /// </summary>
         event EventHandler<CacheAcquireCompleteEventArgs> CacheAcquireComplete;
 
@@ -179,6 +179,11 @@ namespace WixToolset.Mba.Core
         event EventHandler<DetectRelatedBundleEventArgs> DetectRelatedBundle;
 
         /// <summary>
+        /// Fired when a related bundle has been detected for a bundle package.
+        /// </summary>
+        event EventHandler<DetectRelatedBundlePackageEventArgs> DetectRelatedBundlePackage;
+
+        /// <summary>
         /// Fired when a related MSI package has been detected for a package.
         /// </summary>
         event EventHandler<DetectRelatedMsiPackageEventArgs> DetectRelatedMsiPackage;
diff --git a/src/api/burn/WixToolset.Mba.Core/PackageInfo.cs b/src/api/burn/WixToolset.Mba.Core/PackageInfo.cs
index 3681a497..39fe4d73 100644
--- a/src/api/burn/WixToolset.Mba.Core/PackageInfo.cs
+++ b/src/api/burn/WixToolset.Mba.Core/PackageInfo.cs
@@ -56,6 +56,11 @@ namespace WixToolset.Mba.Core
         /// 
         /// </summary>
         UpdateBundle,
+
+        /// <summary>
+        /// 
+        /// </summary>
+        ChainBundle,
     }
 
     /// <summary>
@@ -220,7 +225,11 @@ namespace WixToolset.Mba.Core
                 return null;
             }
 
-            if (attributeValue.Equals("Exe", StringComparison.InvariantCulture))
+            if (attributeValue.Equals("Bundle", StringComparison.InvariantCulture))
+            {
+                return PackageType.ChainBundle;
+            }
+            else if (attributeValue.Equals("Exe", StringComparison.InvariantCulture))
             {
                 return PackageType.Exe;
             }
@@ -268,7 +277,7 @@ namespace WixToolset.Mba.Core
                     package.Type = PackageType.UpgradeBundle;
                     break;
                 default:
-                    throw new Exception(string.Format("Unknown related bundle type: {0}", relationType));
+                    throw new Exception(String.Format("Unknown related bundle type: {0}", relationType));
             }
 
             return package;
@@ -302,7 +311,7 @@ namespace WixToolset.Mba.Core
 
                 if (!packagesById.TryGetValue(id, out var ipackage))
                 {
-                    throw new Exception(string.Format("Failed to find package specified in WixBalPackageInfo: {0}", id));
+                    throw new Exception(String.Format("Failed to find package specified in WixBalPackageInfo: {0}", id));
                 }
 
                 var package = (PackageInfo)ipackage;
@@ -322,7 +331,7 @@ namespace WixToolset.Mba.Core
 
                 if (!packagesById.TryGetValue(id, out var ipackage))
                 {
-                    throw new Exception(string.Format("Failed to find package specified in WixMbaPrereqInformation: {0}", id));
+                    throw new Exception(String.Format("Failed to find package specified in WixMbaPrereqInformation: {0}", id));
                 }
 
                 var package = (PackageInfo)ipackage;
diff --git a/src/api/burn/balutil/balinfo.cpp b/src/api/burn/balutil/balinfo.cpp
index d9cc9b76..f0eb9904 100644
--- a/src/api/burn/balutil/balinfo.cpp
+++ b/src/api/burn/balutil/balinfo.cpp
@@ -433,7 +433,11 @@ static HRESULT ParsePackagesFromXml(
         hr = XmlGetAttributeEx(pNode, L"PackageType", &scz);
         ExitOnFailure(hr, "Failed to get package type for package.");
 
-        if (CSTR_EQUAL == ::CompareStringW(LOCALE_NEUTRAL, 0, L"Exe", -1, scz, -1))
+        if (CSTR_EQUAL == ::CompareStringW(LOCALE_NEUTRAL, 0, L"Bundle", -1, scz, -1))
+        {
+            prgPackages[iPackage].type = BAL_INFO_PACKAGE_TYPE_BUNDLE_CHAIN;
+        }
+        else if (CSTR_EQUAL == ::CompareStringW(LOCALE_NEUTRAL, 0, L"Exe", -1, scz, -1))
         {
             prgPackages[iPackage].type = BAL_INFO_PACKAGE_TYPE_EXE;
         }
diff --git a/src/api/burn/balutil/inc/BAFunctions.h b/src/api/burn/balutil/inc/BAFunctions.h
index 158e65b5..9be3f62f 100644
--- a/src/api/burn/balutil/inc/BAFunctions.h
+++ b/src/api/burn/balutil/inc/BAFunctions.h
@@ -92,6 +92,7 @@ enum BA_FUNCTIONS_MESSAGE
     BA_FUNCTIONS_MESSAGE_ONPLANRELATEDBUNDLETYPE = BOOTSTRAPPER_APPLICATION_MESSAGE_ONPLANRELATEDBUNDLETYPE,
     BA_FUNCTIONS_MESSAGE_ONAPPLYDOWNGRADE = BOOTSTRAPPER_APPLICATION_MESSAGE_ONAPPLYDOWNGRADE,
     BA_FUNCTIONS_MESSAGE_ONEXECUTEPROCESSCANCEL = BOOTSTRAPPER_APPLICATION_MESSAGE_ONEXECUTEPROCESSCANCEL,
+    BA_FUNCTIONS_MESSAGE_ONDETECTRELATEDBUNDLEPACKAGE = BOOTSTRAPPER_APPLICATION_MESSAGE_ONDETECTRELATEDBUNDLEPACKAGE,
 
     BA_FUNCTIONS_MESSAGE_ONTHEMELOADED = 1024,
     BA_FUNCTIONS_MESSAGE_WNDPROC,
diff --git a/src/api/burn/balutil/inc/BalBaseBAFunctions.h b/src/api/burn/balutil/inc/BalBaseBAFunctions.h
index 614d4bcf..6bde05d2 100644
--- a/src/api/burn/balutil/inc/BalBaseBAFunctions.h
+++ b/src/api/burn/balutil/inc/BalBaseBAFunctions.h
@@ -887,6 +887,18 @@ public: // IBootstrapperApplication
         return S_OK;
     }
 
+    virtual STDMETHODIMP OnDetectRelatedBundlePackage(
+        __in_z LPCWSTR /*wzPackageId*/,
+        __in_z LPCWSTR /*wzBundleId*/,
+        __in BOOTSTRAPPER_RELATION_TYPE /*relationType*/,
+        __in BOOL /*fPerMachine*/,
+        __in LPCWSTR /*wzVersion*/,
+        __inout BOOL* /*pfCancel*/
+        )
+    {
+        return S_OK;
+    }
+
 public: // IBAFunctions
     virtual STDMETHODIMP OnPlan(
         )
diff --git a/src/api/burn/balutil/inc/BalBaseBAFunctionsProc.h b/src/api/burn/balutil/inc/BalBaseBAFunctionsProc.h
index b96a180c..4564ad0c 100644
--- a/src/api/burn/balutil/inc/BalBaseBAFunctionsProc.h
+++ b/src/api/burn/balutil/inc/BalBaseBAFunctionsProc.h
@@ -163,6 +163,7 @@ static HRESULT WINAPI BalBaseBAFunctionsProc(
         case BA_FUNCTIONS_MESSAGE_ONPLANRELATEDBUNDLETYPE:
         case BA_FUNCTIONS_MESSAGE_ONAPPLYDOWNGRADE:
         case BA_FUNCTIONS_MESSAGE_ONEXECUTEPROCESSCANCEL:
+        case BA_FUNCTIONS_MESSAGE_ONDETECTRELATEDBUNDLEPACKAGE:
             hr = BalBaseBootstrapperApplicationProc((BOOTSTRAPPER_APPLICATION_MESSAGE)message, pvArgs, pvResults, pvContext);
             break;
         case BA_FUNCTIONS_MESSAGE_ONTHEMELOADED:
diff --git a/src/api/burn/balutil/inc/BalBaseBootstrapperApplication.h b/src/api/burn/balutil/inc/BalBaseBootstrapperApplication.h
index 25570ffd..b661c7c9 100644
--- a/src/api/burn/balutil/inc/BalBaseBootstrapperApplication.h
+++ b/src/api/burn/balutil/inc/BalBaseBootstrapperApplication.h
@@ -1087,6 +1087,19 @@ public: // IBootstrapperApplication
         return S_OK;
     }
 
+    virtual STDMETHODIMP OnDetectRelatedBundlePackage(
+        __in_z LPCWSTR /*wzPackageId*/,
+        __in_z LPCWSTR /*wzBundleId*/,
+        __in BOOTSTRAPPER_RELATION_TYPE /*relationType*/,
+        __in BOOL /*fPerMachine*/,
+        __in LPCWSTR /*wzVersion*/,
+        __inout BOOL* pfCancel
+        )
+    {
+        *pfCancel |= CheckCanceled();
+        return S_OK;
+    }
+
 public: //CBalBaseBootstrapperApplication
     virtual STDMETHODIMP Initialize(
         __in const BOOTSTRAPPER_CREATE_ARGS* pCreateArgs
diff --git a/src/api/burn/balutil/inc/BalBaseBootstrapperApplicationProc.h b/src/api/burn/balutil/inc/BalBaseBootstrapperApplicationProc.h
index b196d183..4ef7bac5 100644
--- a/src/api/burn/balutil/inc/BalBaseBootstrapperApplicationProc.h
+++ b/src/api/burn/balutil/inc/BalBaseBootstrapperApplicationProc.h
@@ -756,6 +756,15 @@ static HRESULT BalBaseBAProcOnApplyDowngrade(
     return pBA->OnApplyDowngrade(pArgs->hrRecommended, &pResults->hrStatus);
 }
 
+static HRESULT BalBaseBAProcOnDetectRelatedBundlePackage(
+    __in IBootstrapperApplication* pBA,
+    __in BA_ONDETECTRELATEDBUNDLEPACKAGE_ARGS* pArgs,
+    __inout BA_ONDETECTRELATEDBUNDLEPACKAGE_RESULTS* pResults
+    )
+{
+    return pBA->OnDetectRelatedBundlePackage(pArgs->wzPackageId, pArgs->wzBundleId, pArgs->relationType, pArgs->fPerMachine, pArgs->wzVersion, &pResults->fCancel);
+}
+
 /*******************************************************************
 BalBaseBootstrapperApplicationProc - requires pvContext to be of type IBootstrapperApplication.
                                      Provides a default mapping between the new message based BA interface and
@@ -1024,6 +1033,9 @@ static HRESULT WINAPI BalBaseBootstrapperApplicationProc(
         case BOOTSTRAPPER_APPLICATION_MESSAGE_ONEXECUTEPROCESSCANCEL:
             hr = BalBaseBAProcOnExecuteProcessCancel(pBA, reinterpret_cast<BA_ONEXECUTEPROCESSCANCEL_ARGS*>(pvArgs), reinterpret_cast<BA_ONEXECUTEPROCESSCANCEL_RESULTS*>(pvResults));
             break;
+        case BOOTSTRAPPER_APPLICATION_MESSAGE_ONDETECTRELATEDBUNDLEPACKAGE:
+            hr = BalBaseBAProcOnDetectRelatedBundlePackage(pBA, reinterpret_cast<BA_ONDETECTRELATEDBUNDLEPACKAGE_ARGS*>(pvArgs), reinterpret_cast<BA_ONDETECTRELATEDBUNDLEPACKAGE_RESULTS*>(pvResults));
+            break;
         }
     }
 
diff --git a/src/api/burn/balutil/inc/IBootstrapperApplication.h b/src/api/burn/balutil/inc/IBootstrapperApplication.h
index 6174c290..a4840228 100644
--- a/src/api/burn/balutil/inc/IBootstrapperApplication.h
+++ b/src/api/burn/balutil/inc/IBootstrapperApplication.h
@@ -723,4 +723,14 @@ DECLARE_INTERFACE_IID_(IBootstrapperApplication, IUnknown, "53C31D56-49C0-426B-A
         __in BOOTSTRAPPER_EXECUTEPROCESSCANCEL_ACTION recommendation,
         __inout BOOTSTRAPPER_EXECUTEPROCESSCANCEL_ACTION* pAction
         ) = 0;
+
+    // OnDetectRelatedBundlePackage - called when the engine detects a related bundle for a BundlePackage.
+    STDMETHOD(OnDetectRelatedBundlePackage)(
+        __in_z LPCWSTR wzPackageId,
+        __in_z LPCWSTR wzBundleId,
+        __in BOOTSTRAPPER_RELATION_TYPE relationType,
+        __in BOOL fPerMachine,
+        __in_z LPCWSTR wzVersion,
+        __inout BOOL* pfCancel
+        ) = 0;
 };
diff --git a/src/api/burn/balutil/inc/balinfo.h b/src/api/burn/balutil/inc/balinfo.h
index 8f61685f..0c7a5b93 100644
--- a/src/api/burn/balutil/inc/balinfo.h
+++ b/src/api/burn/balutil/inc/balinfo.h
@@ -17,6 +17,7 @@ typedef enum BAL_INFO_PACKAGE_TYPE
     BAL_INFO_PACKAGE_TYPE_BUNDLE_ADDON,
     BAL_INFO_PACKAGE_TYPE_BUNDLE_PATCH,
     BAL_INFO_PACKAGE_TYPE_BUNDLE_UPDATE,
+    BAL_INFO_PACKAGE_TYPE_BUNDLE_CHAIN,
 } BAL_INFO_PACKAGE_TYPE;
 
 typedef enum _BAL_INFO_RESTART
diff --git a/src/api/wix/WixToolset.Data/Symbols/SymbolDefinitions.cs b/src/api/wix/WixToolset.Data/Symbols/SymbolDefinitions.cs
index d4a91343..1fd8ded1 100644
--- a/src/api/wix/WixToolset.Data/Symbols/SymbolDefinitions.cs
+++ b/src/api/wix/WixToolset.Data/Symbols/SymbolDefinitions.cs
@@ -142,6 +142,7 @@ namespace WixToolset.Data
         WixBundlePackageCommandLine,
         WixBundlePackageExitCode,
         WixBundlePackageGroup,
+        WixBundlePackageRelatedBundle,
         WixBundlePatchTargetCode,
         WixBundlePayload,
         WixBundlePayloadGroup,
@@ -618,6 +619,9 @@ namespace WixToolset.Data
                 case SymbolDefinitionType.WixBundlePackageGroup:
                     return SymbolDefinitions.WixBundlePackageGroup;
 
+                case SymbolDefinitionType.WixBundlePackageRelatedBundle:
+                    return SymbolDefinitions.WixBundlePackageRelatedBundle;
+
                 case SymbolDefinitionType.WixBundlePatchTargetCode:
                     return SymbolDefinitions.WixBundlePatchTargetCode;
 
diff --git a/src/api/wix/WixToolset.Data/Symbols/WixBundleBundlePackageSymbol.cs b/src/api/wix/WixToolset.Data/Symbols/WixBundleBundlePackageSymbol.cs
index 36b9eb67..dcf59e28 100644
--- a/src/api/wix/WixToolset.Data/Symbols/WixBundleBundlePackageSymbol.cs
+++ b/src/api/wix/WixToolset.Data/Symbols/WixBundleBundlePackageSymbol.cs
@@ -12,6 +12,7 @@ namespace WixToolset.Data
             {
                 new IntermediateFieldDefinition(nameof(WixBundleBundlePackageSymbolFields.Attributes), IntermediateFieldType.Number),
                 new IntermediateFieldDefinition(nameof(WixBundleBundlePackageSymbolFields.BundleId), IntermediateFieldType.String),
+                new IntermediateFieldDefinition(nameof(WixBundleBundlePackageSymbolFields.Version), IntermediateFieldType.String),
                 new IntermediateFieldDefinition(nameof(WixBundleBundlePackageSymbolFields.InstallCommand), IntermediateFieldType.String),
                 new IntermediateFieldDefinition(nameof(WixBundleBundlePackageSymbolFields.RepairCommand), IntermediateFieldType.String),
                 new IntermediateFieldDefinition(nameof(WixBundleBundlePackageSymbolFields.UninstallCommand), IntermediateFieldType.String),
@@ -28,6 +29,7 @@ namespace WixToolset.Data.Symbols
     {
         Attributes,
         BundleId,
+        Version,
         InstallCommand,
         RepairCommand,
         UninstallCommand,
@@ -65,6 +67,12 @@ namespace WixToolset.Data.Symbols
             set => this.Set((int)WixBundleBundlePackageSymbolFields.BundleId, value);
         }
 
+        public string Version
+        {
+            get => (string)this.Fields[(int)WixBundleBundlePackageSymbolFields.Version];
+            set => this.Set((int)WixBundleBundlePackageSymbolFields.Version, value);
+        }
+
         public string InstallCommand
         {
             get => (string)this.Fields[(int)WixBundleBundlePackageSymbolFields.InstallCommand];
diff --git a/src/api/wix/WixToolset.Data/Symbols/WixBundlePackageRelatedBundleSymbol.cs b/src/api/wix/WixToolset.Data/Symbols/WixBundlePackageRelatedBundleSymbol.cs
new file mode 100644
index 00000000..dfb48714
--- /dev/null
+++ b/src/api/wix/WixToolset.Data/Symbols/WixBundlePackageRelatedBundleSymbol.cs
@@ -0,0 +1,60 @@
+// Copyright (c) .NET Foundation and contributors. All rights reserved. Licensed under the Microsoft Reciprocal License. See LICENSE.TXT file in the project root for full license information.
+
+namespace WixToolset.Data
+{
+    using WixToolset.Data.Symbols;
+
+    public static partial class SymbolDefinitions
+    {
+        public static readonly IntermediateSymbolDefinition WixBundlePackageRelatedBundle = new IntermediateSymbolDefinition(
+            SymbolDefinitionType.WixBundlePackageRelatedBundle,
+            new[]
+            {
+                new IntermediateFieldDefinition(nameof(WixBundlePackageRelatedBundleSymbolFields.PackageRef), IntermediateFieldType.String),
+                new IntermediateFieldDefinition(nameof(WixBundlePackageRelatedBundleSymbolFields.BundleId), IntermediateFieldType.String),
+                new IntermediateFieldDefinition(nameof(WixBundlePackageRelatedBundleSymbolFields.Action), IntermediateFieldType.Number),
+            },
+            typeof(WixBundlePackageRelatedBundleSymbol));
+    }
+}
+
+namespace WixToolset.Data.Symbols
+{
+    public enum WixBundlePackageRelatedBundleSymbolFields
+    {
+        PackageRef,
+        BundleId,
+        Action,
+    }
+
+    public class WixBundlePackageRelatedBundleSymbol : IntermediateSymbol
+    {
+        public WixBundlePackageRelatedBundleSymbol() : base(SymbolDefinitions.WixBundlePackageRelatedBundle, null, null)
+        {
+        }
+
+        public WixBundlePackageRelatedBundleSymbol(SourceLineNumber sourceLineNumber, Identifier id = null) : base(SymbolDefinitions.WixBundlePackageRelatedBundle, sourceLineNumber, id)
+        {
+        }
+
+        public IntermediateField this[WixBundlePackageRelatedBundleSymbolFields index] => this.Fields[(int)index];
+
+        public string PackageRef
+        {
+            get => (string)this.Fields[(int)WixBundlePackageRelatedBundleSymbolFields.PackageRef];
+            set => this.Set((int)WixBundlePackageRelatedBundleSymbolFields.PackageRef, value);
+        }
+
+        public string BundleId
+        {
+            get => (string)this.Fields[(int)WixBundlePackageRelatedBundleSymbolFields.BundleId];
+            set => this.Set((int)WixBundlePackageRelatedBundleSymbolFields.BundleId, value);
+        }
+
+        public RelatedBundleActionType Action
+        {
+            get => (RelatedBundleActionType)this.Fields[(int)WixBundlePackageRelatedBundleSymbolFields.Action].AsNumber();
+            set => this.Set((int)WixBundlePackageRelatedBundleSymbolFields.Action, (int)value);
+        }
+    }
+}