Add warning that xpath() doesn't work with non-UTF8 data.

diff --git a/doc/src/sgml/datatype.sgml b/doc/src/sgml/datatype.sgml
index b2c3e7f395886f727775742cba630a23d27ef31a..4844fd63b5192ca9c9a84b8fb8d92b759e687c1d 100644 (file)
--- a/doc/src/sgml/datatype.sgml
+++ b/doc/src/sgml/datatype.sgml
@@ -1,4 +1,4 @@
-
+
 
  
   Data Types
@@ -3958,6 +3958,14 @@ SET xmloption TO { DOCUMENT | CONTENT };
     processed in UTF-8, computations will be most efficient if the
     server encoding is also UTF-8.
    
+
+   
+    
+     Some XML-related functions may not work at all on non-ASCII data
+     when the server encoding is not UTF-8.  This is known to be an
+     issue for xpath() in particular.
+    
+