diff --git a/src/fdt/if_fdt_types.intf.abap b/src/fdt/if_fdt_types.intf.abap
index 65db72d5..58fa1852 100644
--- a/src/fdt/if_fdt_types.intf.abap
+++ b/src/fdt/if_fdt_types.intf.abap
@@ -1,3 +1,23 @@
 INTERFACE if_fdt_types PUBLIC.
   TYPES element_number TYPE n LENGTH 34.
+  TYPES id TYPE sysuuid_c32.
+  TYPES object_type TYPE c LENGTH 2.
+
+  TYPES: BEGIN OF s_message,
+           id          TYPE id,
+           object_type TYPE object_type,
+           msgid       TYPE symsgid,
+           msgty       TYPE symsgty,
+           msgno       TYPE symsgno,
+           msgv1       TYPE symsgv,
+           msgv2       TYPE symsgv,
+           msgv3       TYPE symsgv,
+           msgv4       TYPE symsgv,
+           text        TYPE c LENGTH 250,
+           source      TYPE string,
+           related_id  TYPE id,
+           r_ref       TYPE REF TO data,
+         END OF s_message.
+  TYPES t_message TYPE STANDARD TABLE OF s_message WITH NON-UNIQUE KEY id object_type.
+
 ENDINTERFACE.
\ No newline at end of file
diff --git a/src/ixml/if_ixml_element.intf.abap b/src/ixml/if_ixml_element.intf.abap
index 0fa8e6b9..454872c2 100644
--- a/src/ixml/if_ixml_element.intf.abap
+++ b/src/ixml/if_ixml_element.intf.abap
@@ -1,6 +1,8 @@
 INTERFACE if_ixml_element PUBLIC.
   INTERFACES if_ixml_node.
 
+  ALIASES remove_child FOR if_ixml_node~remove_child.
+
   METHODS:
     remove_attribute_ns
       IMPORTING foo TYPE string,
@@ -54,6 +56,7 @@ INTERFACE if_ixml_element PUBLIC.
     get_elements_by_tag_name
       IMPORTING
         name       TYPE string
+        namespace  TYPE string DEFAULT ''
       RETURNING
         VALUE(val) TYPE REF TO if_ixml_node_collection,
     get_elements_by_tag_name_ns