add attribute country, country_revision, code and sub_code to roadmarking

Signed-off-by: Marcel Sachse <msachse@pmsfit.de>

Author: MarcelOliver

osi_roadmarking.proto

@@ -128,6 +128,29 @@ message RoadMarking
         //
         optional bool is_out_of_service = 7;
 
+        // Specifies the country. See ISO 3166-1, alpha-2 codes
+        // https://en.wikipedia.org/wiki/ISO_3166-1_alpha-2. <br>
+        // e.g. "DE", "FR", "AT"
+        //
+        optional string country = 8;
+
+        // The year the traffic rules come into force. <br>
+        // e.g. "2017"
+        //
+        optional string country_revision = 9;
+
+        // Code identifier according to country code. <br>
+        // code is only unique in combination with #country and #country_revision.  <br>
+        // e.g. http://www.vzkat.de/2017/VzKat.htm
+        //
+        optional string code = 10;
+
+        // Subcode identifier according to country code. <br>
+        // sub_code is only unique in combination with #country and #country_revision.  <br>
+        // e.g. http://www.vzkat.de/2017/VzKat.htm
+        //
+        optional string sub_code = 11;
+
         // Definition of road marking types.
         //
         // \attention Deprecated: OpenDRIVE categorization for traffic signs is more generic than OSI enum