@Override
   public void provideHighlightingFor(XtextResource resource, IHighlightedPositionAcceptor acceptor) {
      // TODO Auto-generated method stub
      if(resource == null || resource.getParseResult() == null) {
         return;
      }
      
      INode root = resource.getParseResult().getRootNode();
      for(INode node : root.getAsTreeIterable()){
         if(node.getGrammarElement() instanceof Greeting){
            acceptor.addPosition(node.getOffset(), node.getLength(), SyntaxHighlightConfigurations.GREETING);
         }
      }
      
   }

public class MyDslSemanticHighlightingCalculator extends DefaultSemanticHighlightingCalculator{

	@Inject
	MyDslGrammarAccess ga;
	
	@Override
	protected void doProvideHighlightingFor(XtextResource resource,
			IHighlightedPositionAcceptor acceptor) {
		ICompositeNode rootNode = resource.getParseResult().getRootNode();
		
		for (INode node : rootNode.getAsTreeIterable()) {
			if (node.getGrammarElement() == ga.getGreetingAccess().getNameIDTerminalRuleCall_1_0()) {
				acceptor.addPosition(node.getOffset(), node.getLength(), DefaultHighlightingConfiguration.KEYWORD_ID);
			}
		}
		super.doProvideHighlightingFor(resource, acceptor);
	}
	
}

public class MyDslSemanticHighlightingCalculator extends DefaultSemanticHighlightingCalculator{
	
	@Override
	protected void doProvideHighlightingFor(XtextResource resource,
			IHighlightedPositionAcceptor acceptor) {
		EObject rootObject = resource.getParseResult().getRootASTElement();
		
		for (Greeting g : EcoreUtil2.getAllContentsOfType(rootObject, Greeting.class)) {
			for (INode node : NodeModelUtils.findNodesForFeature(g, MyDslPackage.Literals.GREETING__NAME)) {
				
				acceptor.addPosition(node.getOffset(), node.getLength(), DefaultHighlightingConfiguration.COMMENT_ID);
			}
		}
		super.doProvideHighlightingFor(resource, acceptor);
	}
	
}