The Query Editor (see figure 4.18) allows the interactive definition of queries. The name of the query is entered in the upper left text field, the super class in the upper right field. After you have entered this information, the list box ``Retrieved Attributes'' will be filled with all available attributes.
Now, you can select the attributes you want to have in the result. For selection of more than one attribute, you must press the CTRL key and select the attribute with a mouse click at the same time.
In the right listbox you can add computed attributes. The right mouse button brings up a popup menu, which lets you add an attribute.
In the text area below the two list boxes, you can add a constraint in the usual CBQL syntax. The constraint must be enclosed in $ signs.
The text area below, shows the Telos definition of the query and is updated after every change you make. If your query is finished, you can press the ``Ask query'' to test the query, i.e. it is told temporarely and the results are shown in separate window. If you are satisfied with the result you can press the Tell button to store the query in the object base.
