Bug 287139 [CommonNavigator] Add core expression to determine initial activation for NCE
Build ID: 20090619-0625 Steps To Reproduce: Currently, the definition of the Navigator Content Extension via plugin.xml allows to specify the boolean attribute allowByDefault which controls if the contributed content is active by default. It makes sence to change the type of the attribute from boolean to core expression, which will allow to evaluate the default context and show content depending on it. This will ease the control of content and enhance the declarative configuration of CNF and NCEs. More information:
bundles/org.eclipse.ui.navigator/src/org/eclipse/ui/internal/navigator/extensions/INavigatorContentExtPtConstants.java
String TAG_POSSIBLE_DROP_TARGETS = "possibleDropTargets"; 	 
	
	
	String TAG_OVERRIDE = "override"; 	
	
	String TAG_FILTER_EXPRESSION = "filterExpression"; 
	
	String TAG_PARENT_EXPRESSION = "parentExpression";  
	
	String ATT_ID = "id"; 
	
	String ATT_NAME = "name"; 	 
	
	String ATT_DESCRIPTION = "description"; 	  
	
	String ATT_CLASS = "class";  
	
	String ATT_PRIORITY = "priority"; 
	
	String ATT_APPEARS_BEFORE = "appearsBefore"; 	
	
	
	String ATT_ICON = "icon"; 
	
	String ATT_WIZARD_ID = "wizardId"; 
	
	String ATT_TYPE = "type"; 		
	
	String ATT_ACTIVE_BY_DEFAULT = "activeByDefault";