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Unlike generic tags, UI tags do not provide much control structure or logic. Rather, they are focussed on using data, either from your action/value stack or from the Data Tags, and displaying data in rich and reusable HTML. All UI tags are driven by templates and themes. While generic tags simply output some content directly from the tag (if there is any content to output), the UI tags defer to a template, often grouped together as a theme, to do the actual rendering.

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