+ <li>New class <tt>broadcast-handler</tt> as a generalization

+      of the older <tt>sax-proxy</tt>.</li>

+      <li>New class <tt>tapping-source</tt>, a klacks source that
+      relays events from an upstream klacks source unchanged, while also
+      emitting them as SAX events to a user-specified handler at the
+      same time.</li>

+      Fixed serialize-event to generate
+      start-prefix-mapping and end-prefix-mapping events.  New function
+      map-current-namespace-declarations.</li>

cxml.asd

@@ -118,7 +118,8 @@
     :components
     ((:file "package")
      (:file "klacks")
-     (:file "klacks-impl"))
+     (:file "klacks-impl")
+     (:file "tap-source"))
     :depends-on (:cxml-xml))
 
 (asdf:defsystem :cxml-test