class JPLSemanticHighlightingCalculator implements 
ISemanticHighlightingCalculator {
	override provideHighlightingFor(XtextResource resource, 
IHighlightedPositionAcceptor acceptor,
		CancelIndicator cancelIndicator) {
		val ICompositeNode rootNode = resource.getParseResult().getRootNode();
		val BidiTreeIterator<INode> it = rootNode.getAsTreeIterable().iterator();
		while (it.hasNext) {
			val INode node = it.next();
			if (node.getGrammarElement() instanceof RuleCall) {
				val rc = node.getGrammarElement() as RuleCall
				val rule = rc.getRule()
				if (rule instanceof TerminalRule) {
					val s = node.text
					println("Node ######################### " + s)
					acceptor.addPosition(node.getOffset(), node.getLength(), 
DefaultHighlightingConfiguration.KEYWORD_ID);
				}
			}
		}
	}
}