$isbn: ISBN to show information for
$output: OutputPage object in use
+'CanIPUseHTTPS': Determine whether the client at a given source IP is likely
+to be able to access the wiki via HTTPS.
+$ip: The IP address in human-readable form
+&$canDo: This reference should be set to false if the client may not be able
+to use HTTPS
+
'CanonicalNamespaces': For extensions adding their own namespaces or altering
the defaults.
Note that if you need to specify namespace protection or content model for