Index: clang-tools-extra/clang-doc/BitcodeReader.cpp
===================================================================
--- clang-tools-extra/clang-doc/BitcodeReader.cpp
+++ clang-tools-extra/clang-doc/BitcodeReader.cpp
@@ -292,6 +292,8 @@
     return decodeRecord(R, I->RefType, Blob);
   case REFERENCE_PATH:
     return decodeRecord(R, I->Path, Blob);
+  case REFERENCE_IS_PATH_VALID:
+    return decodeRecord(R, I->IsPathValid, Blob);
   case REFERENCE_FIELD:
     return decodeRecord(R, F, Blob);
   default:
Index: clang-tools-extra/clang-doc/BitcodeWriter.h
===================================================================
--- clang-tools-extra/clang-doc/BitcodeWriter.h
+++ clang-tools-extra/clang-doc/BitcodeWriter.h
@@ -109,6 +109,7 @@
   REFERENCE_NAME,
   REFERENCE_TYPE,
   REFERENCE_PATH,
+  REFERENCE_IS_PATH_VALID,
   REFERENCE_FIELD,
   RI_LAST,
   RI_FIRST = VERSION
Index: clang-tools-extra/clang-doc/BitcodeWriter.cpp
===================================================================
--- clang-tools-extra/clang-doc/BitcodeWriter.cpp
+++ clang-tools-extra/clang-doc/BitcodeWriter.cpp
@@ -172,6 +172,7 @@
           {REFERENCE_NAME, {"Name", &StringAbbrev}},
           {REFERENCE_TYPE, {"RefType", &IntAbbrev}},
           {REFERENCE_PATH, {"Path", &StringAbbrev}},
+          {REFERENCE_IS_PATH_VALID, {"IsPathValid", &BoolAbbrev}},
           {REFERENCE_FIELD, {"Field", &IntAbbrev}}};
       assert(Inits.size() == RecordIdCount);
       for (const auto &Init : Inits) {
@@ -215,7 +216,7 @@
         // Reference Block
         {BI_REFERENCE_BLOCK_ID,
          {REFERENCE_USR, REFERENCE_NAME, REFERENCE_TYPE, REFERENCE_PATH,
-          REFERENCE_FIELD}}};
+          REFERENCE_IS_PATH_VALID, REFERENCE_FIELD}}};
 
 // AbbreviationMap
 
@@ -387,6 +388,7 @@
   emitRecord(R.Name, REFERENCE_NAME);
   emitRecord((unsigned)R.RefType, REFERENCE_TYPE);
   emitRecord(R.Path, REFERENCE_PATH);
+  emitRecord(R.IsPathValid, REFERENCE_IS_PATH_VALID);
   emitRecord((unsigned)Field, REFERENCE_FIELD);
 }
 
Index: clang-tools-extra/clang-doc/HTMLGenerator.cpp
===================================================================
--- clang-tools-extra/clang-doc/HTMLGenerator.cpp
+++ clang-tools-extra/clang-doc/HTMLGenerator.cpp
@@ -249,7 +249,7 @@
 
 static std::unique_ptr<HTMLNode> genTypeReference(const Reference &Type,
                                                   StringRef CurrentDirectory) {
-  if (Type.Path.empty())
+  if (!Type.IsPathValid)
     return llvm::make_unique<TextNode>(Type.Name);
   llvm::SmallString<128> Path =
       computeRelativePath(Type.Path, CurrentDirectory);
Index: clang-tools-extra/clang-doc/Representation.h
===================================================================
--- clang-tools-extra/clang-doc/Representation.h
+++ clang-tools-extra/clang-doc/Representation.h
@@ -114,11 +114,12 @@
 struct Reference {
   Reference() = default;
   Reference(llvm::StringRef Name) : Name(Name) {}
-  Reference(llvm::StringRef Name, StringRef Path) : Name(Name), Path(Path) {}
+  Reference(llvm::StringRef Name, StringRef Path)
+      : Name(Name), Path(Path), IsPathValid(true) {}
   Reference(SymbolID USR, StringRef Name, InfoType IT)
       : USR(USR), Name(Name), RefType(IT) {}
   Reference(SymbolID USR, StringRef Name, InfoType IT, StringRef Path)
-      : USR(USR), Name(Name), RefType(IT), Path(Path) {}
+      : USR(USR), Name(Name), RefType(IT), Path(Path), IsPathValid(true) {}
 
   bool operator==(const Reference &Other) const {
     return std::tie(USR, Name, RefType) ==
@@ -130,8 +131,11 @@
   InfoType RefType = InfoType::IT_default; // Indicates the type of this
                                            // Reference (namespace, record,
                                            // function, enum, default).
-  llvm::SmallString<128> Path; // Path of directory where the clang-doc
-                               // generated file will be saved
+  llvm::SmallString<128>
+      Path; // Path of directory where the clang-doc generated file will be
+            // saved (possibly unresolved)
+  bool IsPathValid = false; // Indicates if a value has been assigned to Path,
+                            // it could be an empty string
 };
 
 // A base struct for TypeInfos
Index: clang-tools-extra/clang-doc/YAMLGenerator.cpp
===================================================================
--- clang-tools-extra/clang-doc/YAMLGenerator.cpp
+++ clang-tools-extra/clang-doc/YAMLGenerator.cpp
@@ -156,6 +156,7 @@
     IO.mapOptional("Name", Ref.Name, SmallString<16>());
     IO.mapOptional("USR", Ref.USR, SymbolID());
     IO.mapOptional("Path", Ref.Path, SmallString<128>());
+    IO.mapOptional("IsPathValid", Ref.IsPathValid, false);
   }
 };
 
Index: clang-tools-extra/unittests/clang-doc/YAMLGeneratorTest.cpp
===================================================================
--- clang-tools-extra/unittests/clang-doc/YAMLGeneratorTest.cpp
+++ clang-tools-extra/unittests/clang-doc/YAMLGeneratorTest.cpp
@@ -115,16 +115,19 @@
   - Type:
       Name:            'int'
       Path:            'path/to/int'
+      IsPathValid:     true
     Name:            'X'
     Access:          Private
 Parents:
   - Type:            Record
     Name:            'F'
     Path:            'path/to/F'
+    IsPathValid:     true
 VirtualParents:
   - Type:            Record
     Name:            'G'
     Path:            'path/to/G'
+    IsPathValid:     true
 ChildRecords:
   - Type:            Record
     Name:            'ChildStruct'
@@ -181,11 +184,13 @@
   - Type:
       Name:            'int'
       Path:            'path/to/int'
+      IsPathValid:     true
     Name:            'P'
 ReturnType:
   Type:
     Name:            'void'
     Path:            'path/to/void'
+    IsPathValid:     true
 ...
 )raw";
   EXPECT_EQ(Expected, Actual.str());