How To Specify Items to Be Cached in a .cdf File

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In order to specify that an item should be cached but not viewed in the channel pane, use the tag <USAGE VALUE="NONE"> in your .cdf file. For example, to specify that a .wav file should be cached, place this HTML in your .cdf file.

<WWITEM HREF="http://www.microsoft.com/sound.wav">
   <USAGE VALUE="NONE"></USAGE>
</WWITEM>
				

Note that in XML, an element that does not have child elements can be represented in a more compact format. For instance, the above <USAGE> line could be written more compactly in this manner (note the final / at the end of the tag): Also, when listing multiple items that are to be cached but not viewed in the channel pane, instead of marking each one with a <USAGE VALUE="NONE"/>, it is better to place them all in one sub-channel that is marked with a usage tag, as illustrated in the example below:

<CHANNEL>
   <USAGE VALUE="NONE"/>
   <WWITEM HREF="http://www.microsoft.com/sound1.wav"/>
   <WWITEM HREF="http://www.microsoft.com/sound2.wav"/>
   <WWITEM HREF="http://www.microsoft.com/sound3.wav"/>
</CHANNEL>