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<p>The BIRT Design Engine API (DEAPI) provides the Java developers added flexibility to create, explore or modify BIRT report designs programmatically. For example, the BIRT Designer is built using this API. To use the DEAPI in your application, you'll need the design engine SDK. More detailed information are available on the BIRT website.</p>
<p>For example let's try to move a table column on a design using the DEAPI in a RCP (or RAP) application.</p>
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http://blog.zenika.com/index.php?post/2009/07/02/BIRT-utilisation-rptLibrary-et-design-API