moves activate/deactivate to UI service

refs 2620

org.fortiss.tooling.kernel.ui/trunk/src/org/fortiss/tooling/kernel/ui/service/IConstraintVerificationUIService.java

 package org.fortiss.tooling.kernel.ui.service;
 
-import static org.fortiss.tooling.kernel.ui.ToolingKernelUIActivator.getService;
-
 import org.fortiss.tooling.kernel.ToolingKernelActivator;
 import org.fortiss.tooling.kernel.model.constraints.IConstraint;
 import org.fortiss.tooling.kernel.model.constraints.IConstraintVerificationStatus;
@@ -38,4 +36,16 @@ public interface IConstraintVerificationUIService {
 
 	/** Install the given constraint: install notifiers and triggers an "onOutdate" event. */
 	public void install(IConstraint constraint);
+
+	/**
+	 * The following features deal with the usage of constraints to drive the process.
+	 * 
+	 * EXPERIMENTAL.
+	 */
+
+	/** Activates the constraint type. */
+	public <T extends IConstraint> void activate(Class<T> constraintEltClass);
+
+	/** Deactivates the constraint type. */
+	public <T extends IConstraint> void deactivate(Class<T> constraintEltClass);
 }