diff --git a/idl/SMESH_Mesh.idl b/idl/SMESH_Mesh.idl
index a06e663d5..cc97d1e14 100644
--- a/idl/SMESH_Mesh.idl
+++ b/idl/SMESH_Mesh.idl
@@ -37,6 +37,8 @@ module SMESH
   typedef sequence<SMESH_Hypothesis> ListOfHypothesis;
   interface SMESH_GroupBase;
   typedef sequence<SMESH_GroupBase> ListOfGroups;
+  interface SMESH_IDSource;
+  typedef sequence<SMESH_IDSource> ListOfIDSources;
 
   typedef sequence<double    > double_array ;
   typedef sequence<long      > long_array ;
@@ -116,6 +118,7 @@ module SMESH
     VOLUME,
     ELEM0D
   };
+  typedef sequence<ElementType> array_of_ElementType ;
 
   /*!
    * Enumeration for element geometry type, like in SMDS
@@ -257,6 +260,11 @@ module SMESH
      * Result array of number enityties
      */
     long_array GetMeshInfo();
+
+    /*!
+     * Returns types of elements it contains
+     */
+    array_of_ElementType GetTypes();
   };
 
   interface SMESH_Group;