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It is of course also possible to use the media format ID's as they appear in the DAM center. The number at the end is the priority, in case of multiple conflicting rules, e.g. you have one rule based on a mobile device related rendering tag and another rule based on a specific location - then the priority will decide which is followed.
XHTML Properties
This leaves us with only one place where we cannot control the media format selection - and that is the xhtml properties, where typically the editors can easily insert images directly from Digizuite. The solution in that case is an extension to TinyMCE that allows the editors to pick the desired media format, after an image is inserted.
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