@@ -0,0 +1,463 @@
+package gr.iti.mklab.simmo.items;%0A%0A/**%0A * A video item%0A *%0A * @see gr.iti.mklab.simmo.Item%0A * @see gr.iti.mklab.simmo.items.Media%0A *%0A * @version 1.0.0%0A * @since July 7, 2014%0A * @author amoumtzidou%0A */%0Apublic class Audio extends Media %7B%0A%0A    /** The audio duration in seconds */%0A    private long duration;%0A%0A%0A    public long getDuration() %7B%0A        return duration;%0A    %7D%0A%0A    public void setDuration(long duration) %7B%0A        this.duration = duration;%0A    %7D%0A%0A    %0A%7D%0A

Add 'Audio' class. To check the relation between Audio and Text (as well between Video and Text)