MediaWiki: Blank page after install

After installing the lastest version of MediaWiki (V1.12.0), a blank page is displayed when accessing the site. PHP error log shows: PHP Fatal error: Class ‘DOMDocument’ not found in /path/to/wiki/includes/Preprocessor_DOM.php on line 566, referer: http://path/to/wiki/config/index.php Previous versions didn’t have this problem. This was installed on Fedora Core 5 server. After some researches, I found that you…

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