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Oxygen XML Author Eclipse plugin allows you to use custom fonts in the Author mode by specifying them in the CSS using the @font-face media type. Only the src and font-family CSS properties can be used for this media type.

Example: @font-face Rule
    font-family:"Baroque Script";
    /*The location of the loaded TTF font must be relative to the CSS*/

The specified font-family must match the name of the font declared in the .ttf file.