+ 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>
