Designing a site often involves using a repeated set of similar objects. This is true whether the repeated items are thumbnails in a gallery, posts in a blog, items on a product site, or dates on a calendar. Often, these repeated items are created based on external data from XML or server-side data. This is a mainstay of web design and makes for easily updatable and expandable pages. The challenge for the interaction designer at the start of a project is to create the look and behavior of the repeated items without requiring the outside data source to be created. Catalyst deals with this challenge through the use of Data Lists to repeat items and design-time data to give the impression that an outside data source exists.
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