The PropertyName_r structure is an encoding of the PropertyName data structure defined in [MS-OXCDATA]. The semantic meaning is unchanged from the PropertyName data structure.

 typedef struct PropertyName_r {
   FlatUID_r* lpguid;
   DWORD ulReserved;
   long lID;
 } PropertyName_r;

lpguid: Encodes the GUID field of the PropertyName data structure. This field is encoded as a FlatUID_r data structure.

ulReserved: Reserved. All clients and servers MUST set this value to the constant 0x00000000.

lID: Encodes the lID field of the PropertyName data structure. In addition to the definition of the LID field, this field is always present in the PropertyName_r data structure; it is not optional.