NOTE: This API is now obsolete.
Provides the code-behind for the mappings file.
Assembly: Microsoft.SharePoint.Publishing (in Microsoft.SharePoint.Publishing.dll)
Because of the nature of the library (Master Page Gallery) in which the mappings file lives, every user who has access to the site can navigate to the mappings file page and see its content. This is true even for anonymous users once anonymous access is granted. The class is used to prevent the rendition of the mappings file if it is directly requested.