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With the GUI model individual adjustments (independent of the final output format) at the generated graphical user interface can be made. The presentation logic is partitioned in layout and behavior-specific (behaviour) ranges. The 'Layout Model' determines the appearance and the arrangement of the graphic elements, whereby the 'Behaviour Model' describes rules and conditions of the graphical front end. The description of the GUI model happens by clear addressings on one ore or several parts from the data model expressed by the use of the W3C-Standard XPath.
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