diff --git a/reactos/include/ddk/unknown.h b/reactos/include/ddk/unknown.h
new file mode 100644
index 00000000000..bbff965ee8c
--- /dev/null
+++ b/reactos/include/ddk/unknown.h
@@ -0,0 +1,55 @@
+#ifndef _UNKNOWN_H_
+#define _UNKNOWN_H_
+
+#ifdef __cplusplus
+extern "C" {
+#include <wdm.h>
+}
+#else
+#include <wdm.h>
+#endif
+
+#include <windef.h>
+#define COM_NO_WINDOWS_H
+#include <basetyps.h>
+#ifdef PUT_GUIDS_HERE
+#include <initguid.h>
+#endif
+
+DEFINE_GUID(IID_IUnknown, 0x00000000, 0x0000, 0x0000, 0xC0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x46);
+#if defined(__cplusplus) && _MSC_VER >= 1100
+    struct __declspec(uuid("00000000-0000-0000-C000-000000000046")) IUnknown;
+#endif
+
+#undef INTERFACE
+#define INTERFACE IUnknown
+DECLARE_INTERFACE(IUnknown)
+{
+    STDMETHOD(QueryInterface)
+    (   THIS_
+        IN      REFIID,
+        OUT     PVOID *
+    )   PURE;
+
+    STDMETHOD_(ULONG,AddRef)
+    (   THIS
+    )   PURE;
+
+    STDMETHOD_(ULONG,Release)
+    (   THIS
+    )   PURE;
+};
+#undef INTERFACE
+
+typedef IUnknown *PUNKNOWN;
+typedef
+HRESULT
+(*PFNCREATEINSTANCE)
+(
+  OUT PUNKNOWN *  Unknown,
+  IN  REFCLSID    ClassId,
+  IN  PUNKNOWN    OuterUnknown,
+  IN  POOL_TYPE   PoolType
+);
+#endif
+
diff --git a/reactos/include/ddk/xmldsodid.h b/reactos/include/ddk/xmldsodid.h
new file mode 100644
index 00000000000..d80d1463f92
--- /dev/null
+++ b/reactos/include/ddk/xmldsodid.h
@@ -0,0 +1,10 @@
+
+#ifndef __XMLDSODID_H__
+#define __XMLDSODID_H__
+#define DISPID_XOBJ_MIN                         0x00010000
+#define DISPID_XOBJ_MAX                         0x0001FFFF
+#define DISPID_XOBJ_BASE                        DISPID_XOBJ_MIN
+#define  DISPID_XMLDSO                          DISPID_XOBJ_BASE
+#define  DISPID_XMLDSO_DOCUMENT                 DISPID_XMLDSO  +  1
+#define  DISPID_XMLDSO_JAVADSOCOMPATIBLE        DISPID_XMLDSO_DOCUMENT  +  1
+#endif
\ No newline at end of file