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Modification of expressions (relations or constraints) is done by means of the Expression Editor. The window automatically opens when you select an expression and press F2. You can see expressions in the Knowledge Browser by:

• Double clicking on the class in the tree view;
• Go to a specific relation through the browsing process described above;
• Make a specific view by means of the filters in the Knowledge Browser;

When the Expression Editor is opened, it shows the expression in the top part and any additional attributes and data in the bottom part. You can simply modify the expression in the normal way.

The Expression Editor contains syntax information through the Tooltip [2] and a proposing mechanism (a drop down box) for available functions and parameters, based on the parameter type of the left side parameter and any further requirements inside a syntax of a intrinsic function. These two assistants work dynamically while typing your expression. Furthermore, we use syntax coloring for string information (not string parameters), brackets and logical words like AND, THEN, ELSEIF, etc.

New relations can be added using the right mouse menu of the Knowledge Browser. The same Expression Editor is opened and the last parameter or relation that was in focus is included as starting point.

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• Trace Viewer, specialized window to debug modeling and evaluation of solutions;
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• Expression Editor, to edit expressions (relations, functions, constraints);
• Compose Text, to compose text based on text fragments in the Knowledge Browser or Workbase;

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