libxl: Keyed unions key off an enum instead of an arbitrary expression

Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
Acked-by: Ian Jackson <ian.jackson.citrix.com>
Committed-by: Ian Jackson <ian.jackson.citrix.com>

1 files changed, 3 insertions, 7 deletions

diff --git a/tools/libxl/idl.txt b/tools/libxl/idl.txt
index dad59ac50c..271a2a8900 100644
--- a/tools/libxl/idl.txt
+++ b/tools/libxl/idl.txt
@@ -127,13 +127,9 @@ libxltype.KeyedUnion
  upon another member in the containing type.
 
  The KeyedUnion.keyvar_name must contain the name of the member of the
- containing type which determines the valid member of the union
-
- The fields in a KeyedUnion have an extra Field.keyvar_expr
- property. This must be a string containing a single "%s" format
- specifier such that when "%s" is substited by an instance of
- KeyedUnion.keyvar_name it becomes a C expression which evaluates to
- True IFF this field currently contains valid data.
+ containing type which determines the valid member of the union. The
+ member referenced by KeyedUnion.keyvar_name has type
+ KeyedUnion.keyvar_type which must be an instance of the Enumeration type.
 
 Standard Types
 --------------