diff --git a/dix/property.c b/dix/property.c
index 872658b5e..86222818a 100644
--- a/dix/property.c
+++ b/dix/property.c
@@ -123,10 +123,10 @@ static void
 notifyVRRMode(ClientPtr pClient, WindowPtr pWindow, int state, PropertyPtr pProp)
 {
     const char *pName = NameForAtom(pProp->propertyName);
-    if (pName == NULL || strcmp(pName, "_VARIABLE_REFRESH") || pProp->format != 32 || pProp->size != 1)
+    if (pName == NULL || strcmp(pName, "_VARIABLE_REFRESH") || pProp->value.format != 32 || pProp->value.size != 1)
         return;
 
-    WindowVRRMode mode = (WindowVRRMode)(state == PropertyNewValue ? (*((uint32_t*)pProp->data)) : 0);
+    WindowVRRMode mode = (WindowVRRMode)(state == PropertyNewValue ? (*((uint32_t*)pProp->value.data)) : 0);
 
 #ifdef XINERAMA
     if (!noPanoramiXExtension) {
@@ -241,10 +241,10 @@ ProcRotateProperties(ClientPtr client)
             notifyVRRMode(client, pWin, PropertyNewValue, props[i]);
 
             /* Preserve name and devPrivates */
-            props[j]->type = saved[i].type;
-            props[j]->format = saved[i].format;
-            props[j]->size = saved[i].size;
-            props[j]->data = saved[i].data;
+            props[j]->value.type = saved[i].value.type;
+            props[j]->value.format = saved[i].value.format;
+            props[j]->value.size = saved[i].value.size;
+            props[j]->value.data = saved[i].value.data;
         }
     }
  out:
@@ -360,9 +360,9 @@ dixChangeWindowProperty(ClientPtr pClient, WindowPtr pWin, Atom property,
            existing format and type are irrelevant when using the mode
            "PropModeReplace" since they will be written over. */
 
-        if ((format != pProp->format) && (mode != PropModeReplace))
+        if ((format != pProp->value.format) && (mode != PropModeReplace))
             return BadMatch;
-        if ((pProp->type != type) && (mode != PropModeReplace))
+        if ((pProp->value.type != type) && (mode != PropModeReplace))
             return BadMatch;
 
         /* save the old values for later */
@@ -375,43 +375,43 @@ dixChangeWindowProperty(ClientPtr pClient, WindowPtr pWin, Atom property,
                     return BadAlloc;
                 memcpy(data, value, totalSize);
             }
-            pProp->data = data;
-            pProp->size = len;
-            pProp->type = type;
-            pProp->format = format;
+            pProp->value.data = data;
+            pProp->value.size = len;
+            pProp->value.type = type;
+            pProp->value.format = format;
         }
         else if (len == 0) {
             /* do nothing */
         }
         else if (mode == PropModeAppend) {
-            unsigned char *data = calloc(pProp->size + len, sizeInBytes);
+            unsigned char *data = calloc(pProp->value.size + len, sizeInBytes);
             if (!data)
                 return BadAlloc;
-            memcpy(data, pProp->data, pProp->size * sizeInBytes);
-            memcpy(data + pProp->size * sizeInBytes, value, totalSize);
-            pProp->data = data;
-            pProp->size += len;
+            memcpy(data, pProp->value.data, pProp->value.size * sizeInBytes);
+            memcpy(data + pProp->value.size * sizeInBytes, value, totalSize);
+            pProp->value.data = data;
+            pProp->value.size += len;
         }
         else if (mode == PropModePrepend) {
-            unsigned char *data = calloc(len + pProp->size, sizeInBytes);
+            unsigned char *data = calloc(len + pProp->value.size, sizeInBytes);
             if (!data)
                 return BadAlloc;
-            memcpy(data + totalSize, pProp->data, pProp->size * sizeInBytes);
+            memcpy(data + totalSize, pProp->value.data, pProp->value.size * sizeInBytes);
             memcpy(data, value, totalSize);
-            pProp->data = data;
-            pProp->size += len;
+            pProp->value.data = data;
+            pProp->value.size += len;
         }
 
         /* Allow security modules to check the new content */
         access_mode |= DixPostAccess;
         rc = XaceHookPropertyAccess(pClient, pWin, &pProp, access_mode);
         if (rc == Success) {
-            if (savedProp.data != pProp->data)
-                free(savedProp.data);
+            if (savedProp.value.data != pProp->value.data)
+                free(savedProp.value.data);
         }
         else {
-            if (savedProp.data != pProp->data)
-                free(pProp->data);
+            if (savedProp.value.data != pProp->value.data)
+                free(pProp->value.data);
             *pProp = savedProp;
             return rc;
         }
@@ -539,13 +539,13 @@ ProcGetProperty(ClientPtr client)
     /* If the request type and actual type don't match. Return the
        property information, but not the data. */
 
-    if (((p.type != pProp->type) && (p.type != AnyPropertyType))) {
+    if (((p.type != pProp->value.type) && (p.type != AnyPropertyType))) {
         xGetPropertyReply rep = {
             .type = X_Reply,
             .sequenceNumber = client->sequence,
-            .bytesAfter = pProp->size,
-            .format = pProp->format,
-            .propertyType = pProp->type
+            .bytesAfter = pProp->value.size,
+            .format = pProp->value.format,
+            .propertyType = pProp->value.type
         };
         if (client->swapped) {
             swaps(&rep.sequenceNumber);
@@ -559,7 +559,7 @@ ProcGetProperty(ClientPtr client)
 /*
  *  Return type, format, value to client
  */
-    n = (pProp->format / 8) * pProp->size;      /* size (bytes) of prop */
+    n = (pProp->value.format / 8) * pProp->value.size; /* size (bytes) of prop */
     ind = p.longOffset << 2;
 
     /* If longOffset is invalid such that it causes "len" to
@@ -576,10 +576,10 @@ ProcGetProperty(ClientPtr client)
         .type = X_Reply,
         .sequenceNumber = client->sequence,
         .bytesAfter = n - (ind + len),
-        .format = pProp->format,
+        .format = pProp->value.format,
         .length = bytes_to_int32(len),
-        .nItems = len / (pProp->format / 8),
-        .propertyType = pProp->type
+        .nItems = len / (pProp->value.format / 8),
+        .propertyType = pProp->value.type
     };
 
     if (p.delete && (rep.bytesAfter == 0)) {
@@ -590,7 +590,7 @@ ProcGetProperty(ClientPtr client)
     void *payload = calloc(1, len);
     if (!payload)
         return BadAlloc;
-    memcpy(payload, (char*)(pProp->data) + ind, len);
+    memcpy(payload, (char*)(pProp->value.data) + ind, len);
 
     if (p.delete && (rep.bytesAfter == 0)) {
         /* Delete the Property */
diff --git a/dix/property_list.c b/dix/property_list.c
index b46a30a15..f96ddf3b3 100644
--- a/dix/property_list.c
+++ b/dix/property_list.c
@@ -12,7 +12,7 @@
 void dixPropertyFree(PropertyPtr pr)
 {
     if (pr) {
-        free(pr->data);
+        free(pr->value.data);
         dixFreeObjectWithPrivates(pr, PRIVATE_PROPERTY);
     }
 }
@@ -34,11 +34,11 @@ PropertyPtr dixPropertyCreate(Atom type, Atom name, int format, size_t len,
 
     memcpy(data, value, totalSize);
 
-    pProp->data = data;
     pProp->propertyName = name;
-    pProp->format = format;
-    pProp->size = len;
-    pProp->type = type;
+    pProp->value.data = data;
+    pProp->value.format = format;
+    pProp->value.size = len;
+    pProp->value.type = type;
 
     return pProp;
 }
diff --git a/dix/window.c b/dix/window.c
index f4d39fd75..06793c0ef 100644
--- a/dix/window.c
+++ b/dix/window.c
@@ -200,10 +200,10 @@ get_window_name(WindowPtr pWin)
         return overlay_win_name;
 
     for (prop = pWin->properties; prop; prop = prop->next) {
-        if (prop->propertyName == XA_WM_NAME && prop->type == XA_STRING &&
-            prop->data) {
-            len = min(prop->size, WINDOW_NAME_BUF_LEN - 1);
-            memcpy(buf, prop->data, len);
+        if (prop->propertyName == XA_WM_NAME &&
+            prop->value.type == XA_STRING && prop->value.data) {
+            len = min(prop->value.size, WINDOW_NAME_BUF_LEN - 1);
+            memcpy(buf, prop->value.data, len);
             buf[len] = '\0';
             return buf;
         }
diff --git a/hw/xfree86/sdksyms.sh b/hw/xfree86/sdksyms.sh
index 28bd9d0c9..6d3744fe3 100755
--- a/hw/xfree86/sdksyms.sh
+++ b/hw/xfree86/sdksyms.sh
@@ -265,6 +265,9 @@ cat > sdksyms.c << EOF
 #include "xkbrules.h"
 #include "xserver-properties.h"
 
+// new SDK files
+#include "property_value.h"
+
 EOF
 
 topdir=$(readlink -f $1)
diff --git a/hw/xwin/winmultiwindowclass.c b/hw/xwin/winmultiwindowclass.c
index 667858a14..c43569e2b 100644
--- a/hw/xwin/winmultiwindowclass.c
+++ b/hw/xwin/winmultiwindowclass.c
@@ -60,13 +60,14 @@ winMultiWindowGetClassHint(WindowPtr pWin, char **res_name, char **res_class)
 
     while (prop) {
         if (prop->propertyName == XA_WM_CLASS
-            && prop->type == XA_STRING && prop->format == 8 && prop->data) {
+            && prop->value.type == XA_STRING
+            && prop->value.format == 8 && prop->value.data) {
             /*
               WM_CLASS property should consist of 2 null terminated strings, but we
               must handle the cases when one or both is absent or not null terminated
             */
-            len_name = strlen((char *) prop->data);
-            if (len_name > prop->size) len_name = prop->size;
+            len_name = strlen((char *) prop->value.data);
+            if (len_name > prop->value.size) len_name = prop->value.size;
 
             (*res_name) = calloc(1, len_name + 1);
 
@@ -76,12 +77,12 @@ winMultiWindowGetClassHint(WindowPtr pWin, char **res_name, char **res_class)
             }
 
             /* Copy name and ensure null terminated */
-            strncpy((*res_name), prop->data, len_name);
+            strncpy((*res_name), prop->value.data, len_name);
             (*res_name)[len_name] = '\0';
 
             /* Compute length of class name, it could be that it is absent or not null terminated */
-            len_class = (len_name >= prop->size) ? 0 : (strlen(((char *) prop->data) + 1 + len_name));
-            if (len_class > prop->size - 1 - len_name) len_class = prop->size - 1 - len_name;
+            len_class = (len_name >= prop->value.size) ? 0 : (strlen(((char *) prop->value.data) + 1 + len_name));
+            if (len_class > prop->value.size - 1 - len_name) len_class = prop->value.size - 1 - len_name;
 
             (*res_class) = calloc(1, len_class + 1);
 
@@ -94,7 +95,7 @@ winMultiWindowGetClassHint(WindowPtr pWin, char **res_name, char **res_class)
             }
 
             /* Copy class name and ensure null terminated */
-            strncpy((*res_class), ((char *) prop->data) + 1 + len_name, len_class);
+            strncpy((*res_class), ((char *) prop->value.data) + 1 + len_name, len_class);
             (*res_class)[len_class] = '\0';
 
             return 1;
@@ -119,8 +120,8 @@ winMultiWindowGetWMHints(WindowPtr pWin, WinXWMHints * hints)
     memset(hints, 0, sizeof(WinXWMHints));
 
     while (prop) {
-        if (prop->propertyName == XA_WM_HINTS && prop->data) {
-            memcpy(hints, prop->data, sizeof(WinXWMHints));
+        if (prop->propertyName == XA_WM_HINTS && prop->value.data) {
+            memcpy(hints, prop->value.data, sizeof(WinXWMHints));
             return 1;
         }
         else
@@ -143,8 +144,9 @@ winMultiWindowGetWindowRole(WindowPtr pWin, char **res_role)
     *res_role = NULL;
     while (prop) {
         if (prop->propertyName == AtmWmWindowRole()
-            && prop->type == XA_STRING && prop->format == 8 && prop->data) {
-            len_role = prop->size;
+            && prop->value.type == XA_STRING
+            && prop->value.format == 8 && prop->value.data) {
+            len_role = prop->value.size;
 
             (*res_role) = calloc(1, len_role + 1);
 
@@ -153,7 +155,7 @@ winMultiWindowGetWindowRole(WindowPtr pWin, char **res_role)
                 return 0;
             }
 
-            strncpy((*res_role), prop->data, len_role);
+            strncpy((*res_role), prop->value.data, len_role);
             (*res_role)[len_role] = 0;
 
             return 1;
@@ -178,8 +180,8 @@ winMultiWindowGetWMNormalHints(WindowPtr pWin, WinXSizeHints * hints)
     memset(hints, 0, sizeof(WinXSizeHints));
 
     while (prop) {
-        if (prop->propertyName == XA_WM_NORMAL_HINTS && prop->data) {
-            memcpy(hints, prop->data, sizeof(WinXSizeHints));
+        if (prop->propertyName == XA_WM_NORMAL_HINTS && prop->value.data) {
+            memcpy(hints, prop->value.data, sizeof(WinXSizeHints));
             return 1;
         }
         else
@@ -205,7 +207,7 @@ winMultiWindowGetTransientFor(WindowPtr pWin, Window *pDaddyId)
     while (prop) {
         if (prop->propertyName == XA_WM_TRANSIENT_FOR) {
             if (pDaddyId)
-                memcpy(pDaddyId, prop->data, sizeof(Window));
+                memcpy(pDaddyId, prop->value.data, sizeof(Window));
             return 1;
         }
         else
@@ -232,8 +234,8 @@ winMultiWindowGetWMName(WindowPtr pWin, char **wmName)
 
     while (prop) {
         if (prop->propertyName == XA_WM_NAME
-            && prop->type == XA_STRING && prop->data) {
-            len_name = prop->size;
+            && prop->value.type == XA_STRING && prop->value.data) {
+            len_name = prop->value.size;
 
             (*wmName) = calloc(1, len_name + 1);
 
@@ -242,7 +244,7 @@ winMultiWindowGetWMName(WindowPtr pWin, char **wmName)
                 return 0;
             }
 
-            strncpy((*wmName), prop->data, len_name);
+            strncpy((*wmName), prop->value.data, len_name);
             (*wmName)[len_name] = 0;
 
             return 1;
diff --git a/include/meson.build b/include/meson.build
index 1e9ed1950..8c1630d6e 100644
--- a/include/meson.build
+++ b/include/meson.build
@@ -458,6 +458,7 @@ if build_xorg
             'pixmapstr.h',
             'privates.h',
             'property.h',
+            'property_value.h',
             'ptrveloc.h',
             'region.h',
             'regionstr.h',
diff --git a/include/property_value.h b/include/property_value.h
new file mode 100644
index 000000000..4f576ef38
--- /dev/null
+++ b/include/property_value.h
@@ -0,0 +1,21 @@
+/* SPDX-License-Identifier: MIT OR X11
+ *
+ * Copyright © 2024 Enrico Weigelt, metux IT consult <info@metux.net>
+ *
+ * This header is part of the SDK / public driver API
+ */
+#ifndef _XORG_SDK_PROPERTY_VALUE_H
+#define _XORG_SDK_PROPERTY_VALUE_H
+
+#include <stdint.h>
+
+#include "misc.h" // ATOM type
+
+typedef struct _PropertyValue {
+    ATOM type;                  /* ignored by server */
+    uint32_t format;            /* format of data for swapping - 8,16,32 */
+    uint32_t size;              /* size of data in (format/8) bytes */
+    void *data;                 /* private to client */
+} PropertyValueRec, *PropertyValuePtr;
+
+#endif /* _XORG_SDK_PROPERTY_VALUE_H */
diff --git a/include/propertyst.h b/include/propertyst.h
index d8ca840a0..31cc4b140 100644
--- a/include/propertyst.h
+++ b/include/propertyst.h
@@ -46,9 +46,12 @@ SOFTWARE.
 
 #ifndef PROPERTYSTRUCT_H
 #define PROPERTYSTRUCT_H
+
 #include "misc.h"
 #include "property.h"
 #include "privates.h"
+#include "property_value.h"
+
 /*
  *   PROPERTY -- property element
  */
@@ -56,10 +59,7 @@ SOFTWARE.
 typedef struct _Property {
     struct _Property *next;
     ATOM propertyName;
-    ATOM type;                  /* ignored by server */
-    uint32_t format;            /* format of data for swapping - 8,16,32 */
-    uint32_t size;              /* size of data in (format/8) bytes */
-    void *data;                 /* private to client */
+    PropertyValueRec value;
     PrivateRec *devPrivates;
 } PropertyRec;