diff --git a/xml/sax-handler.lisp b/xml/sax-handler.lisp
index 0f0b8ea..4c2acc1 100644
--- a/xml/sax-handler.lisp
+++ b/xml/sax-handler.lisp
@@ -73,6 +73,7 @@
 	   #:start-dtd
 	   #:end-dtd
 	   #:start-internal-subset
+	   #:unparsed-internal-subset
 	   #:end-internal-subset
            #:unparsed-entity-declaration
            #:external-entity-declaration
@@ -337,6 +338,11 @@ any definition from the internal subset is reported.")
 finished, if present.")
   (:method ((handler t)) nil))
 
+(defgeneric unparsed-internal-subset (handler str)
+  (:documentation "Reports that an internal subset is present, but has not
+been parsed and is available as a string.")
+  (:method ((handler t) str) nil))
+
 (defgeneric unparsed-entity-declaration
     (handler name public-id system-id notation-name)
   (:documentation