Modifying a restriction in the Restriction Editor is very easy. Click on the attribute to change, it can be modified directly in the table.
For example, say a Vehicle can actually have more than a single type of fuel. Click on the Restriction column and select minCardinality from the drop-down menu.
Notice that because Automobile inherits from Vehicle, the restriction has been changed there as well.
Similiarly, to change the Property to which a restriction applies, simply click on it to select a new value.
Changing the Value of a Restriction is slightly different. To change a the value of a restriction, click on the table to select the value to change. The contents of the cell are replaced with a small button with an elipsis on it. Click that button to open the Restriction Value dialog.
The Value editor is smart - if a cardinality restriction is being edited, only integers will be accepted as valid values. If Classes or Individuals are acceptable, they will be available via the Select a value button.
To delete a Restriction, simply select it in the table and click the Remove button.
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Using the Visual Restriction Editor
Adding a new Restriction
Advanced Restriction Editing