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View data preparation logic should be specified as actions in the XML screen definition or if necessary implemented in a dynamic scripting language such as Groovy, JavaScript, BeanShell, Jython or Jacl to make it easy to modify the user interface on the fly. Generic data retreival retrieval should be implemented as services which should be called from these dynamic action scripts. This makes it easier to share and reuse this functionality in multiple pages and in other types of user interfaces.

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