Added some more links to the "See also" section.

Doc/lib/xmlsax.tex

@@ -117,6 +117,15 @@ exception classes.
             the SAX API.  It provides a Java implementation and online
             documentation.  Links to implementations and historical
             information are also available.}
+
+  \seemodule{xml.sax.handler}{Definitions of the interfaces for
+             application-provided objects.}
+
+  \seemodule{xml.sax.saxutils}{Convenience functions for use in SAX
+             applications.}
+
+  \seemodule{xml.sax.xmlreader}{Definitions of the interfaces for
+             parser-provided objects.}
 \end{seealso}