Added link to libvirt-qpid on front page, and docs on URI formats for each driver

docs/drvxen.html.in

@@ -44,6 +44,23 @@
       </li>
     </ul>
 
+    <h2>Connections to Xen driver</h2>
+
+    <p>
+    The libvirt Xen driver is a single-instance privileged driver,
+    with a driver name of 'xen'. Some example conection URIs for
+    the libvirt driver are:
+    </p>
+
+    <pre>
+    xen:///                        (local access, direct)
+    xen+unix:///                   (local access, via daemon)
+    xen://example.com/             (remote access, TLS/x509)
+    xen+tcp://example.com/         (remote access, SASl/Kerberos)
+    xen+ssh://root@example.com/    (remote access, SSH tunnelled)
+    </pre>
+
+
     <h2><a name="xmlconfig">Example domain XML config</a></h2>
 
     <p>