first steps for (de)activate functions in constraints

refs 2620

org.fortiss.tooling.kernel/trunk/src/org/fortiss/tooling/kernel/extension/IConstraintVerifier.java

@@ -56,4 +56,10 @@ public interface IConstraintVerifier<T extends IConstraint> extends IEObjectAwar
 
 	/** True if this constraint shall be displayed as a development process constraint. */
 	public boolean isUsableForDevelopmentProcess();
+
+	/** Activates the constraint type. */
+	public void activate();
+
+	/** Deactivates the constraint type. */
+	public void deactivate();
 }