| V.I. Corporation. GECK User's Guide, 1990. |
....employ constraints to any degree; those that do are research prototypes [1, 20, 2, 21] Perhaps one reason is that graphical editors are notoriously difficult to implement, even with conventional user interface toolkits. Several frameworks for building graphical editors have been reported recently [23, 24, 27] that address this problem. These frameworks provide a generic software architecture that typically supports the following: ffl the definition of domain specific graphical components and their semantics ffl mechanisms for composing and structuring components ffl (reversible) operations on ....
V.I. Corporation. GECK User's Guide, 1990.
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