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When set to '1', turns on the graphical buttons in the "Edit Page" form.
        # turn on graphical edit buttons
        $EnableGUIButtons = 1;

When set to '1', posting of pages requires the author to provide an author name. Otherwise, authors can post without a name.
        # require authors to provide a name
        $EnablePostAuthorRequired = 1; 

The pattern used to determine if a page should be deleted. The default is to remove pages that contain only the single word "delete" (and optional spaces).
        # change delete word to "remove"
        $DeleteKeyPattern = "^\\s*remove\\s*$";
        # delete any page with no visible text, i.e., empty
        $DeleteKeyPattern = "^\\s*$";

Name of the page (or an array of names) to be used as the default text for any newly created pages.
        # Use 'Main.NewPageTemplate' as default text of all new pages
        $EditTemplatesFmt = 'Main.NewPageTemplate';
        # Use 'Template' in the current group for new pages
        $EditTemplatesFmt = '$Group.Template';
        # Use 'Template' in the current group if it exists, otherwise
        # use 'Main.NewPageTemplate'
        $EditTemplatesFmt = array('$Group.Template', 'Main.NewPageTemplate');

The text that should be displayed when browsing non-existent pages.
        $DefaultPageTextFmt = 'Page $Name does not exist';

This array contains the sequence of functions that are called when a page is edited. It can be customized to provide additional functions to be called as part of the editing process. The standard setting is:
        $EditFunctions = array('EditTemplates', 'RestorePage', 'ReplaceOnSave', 
          'SaveAttributes', 'PostPage', 'PostRecentChanges', 'PreviewPage'); 

With this array you can give a pattern as key and a text which should replace it when saving an edited text. The following example replaces every occurence of [[test:sometext with [[special:--sometext when you save an edited page.
        # Replace text on Save (add pattern and replacement to array $ROSPatterns)
        $ROSPatterns["/\\[\\[test:([^\\s$UrlExcludeChars]*)/"] = "[[special:--\$1";

Set to a true value if the page is actually saved (e.g., this is used to tell the RecentChanges handlers if they need to update).

By default, this is the HTML to be displayed for an edit form.

Like $HandleBrowseFmt, this specifies the entire output format for ?action=edit for a page.