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The $rdf_namespaces variable is not found in the default maintenance-page.tpl, but Zen has it and it causes PHP notices when the maintenance page is viewed:
Notice: Undefined variable: rdf_namespaces in include() (line 17 of sites/all/themes/zen/templates/maintenance-page.tpl.php).
This variable needs to be removed.
First reported here: http://drupal.org/node/1179128#comment-5221910
Comments
Comment #1
JohnAlbinThis variable is only in 7.x-5.x, not the 7.x-3.x branch.
Fixed. http://drupalcode.org/project/zen.git/commitdiff/06af06d
Comment #2.0
(not verified) CreditAttribution: commentedAdd link to original bug report.