xmloff: document potential pitfall with SvI18NMap usage

Change-Id: I37050203f9d7b4f04b6d0b0dc5c4e04855d017f7

include/xmloff/txtimp.hxx

@@ -362,6 +362,17 @@ enum XMLTextType
     XML_TEXT_TYPE_CHANGED_REGION
 };
 
+/// variable type (for XMLSetVarFieldImportContext)
+enum VarType
+{
+    VarTypeSimple,
+    VarTypeUserField,
+    VarTypeSequence
+    // see following NOTE!
+};
+
+// NOTE: these values must be distinct from any in "enum VarType" because they
+// are used as keys to SvI18NMap::Add()
 #define XML_TEXT_RENAME_TYPE_FRAME 10
 #define XML_TEXT_RENAME_TYPE_TABLE 20
 

xmloff/inc/txtvfldi.hxx

@@ -30,17 +30,6 @@
 #include <com/sun/star/beans/XPropertySetInfo.hpp>
 
 
-
-/// variable type (for XMLSetVarFieldImportContext)
-enum VarType
-{
-    VarTypeSimple,
-    VarTypeUserField,
-    VarTypeSequence
-};
-
-
-
 /** helper class: parses value-type and associated value attributes */
 class XMLValueImportHelper
 {