List<Pair<Keyword,Keyword>> pairs = f.findKeywordPairs("{", "}");
			for (Pair<Keyword, Keyword> pair : pairs) {
				c.setIndentation(pair.getFirst(), pair.getSecond());
			}

class MyDslFormatter extends AbstractDeclarativeFormatter {

	@Inject extension MyDslGrammarAccess
	
	override protected void configureFormatting(FormattingConfig c) {
		findKeywordPairs("{","}").forEach[
			c.setIndentation(first, second)
		]
	}
}

ContentModel ct {
	ID="lll" 
	displayName = "displayName"
      WebApplication webapp{
	  ID="fff"	
	  displayName = "displayName"
	  SiteCollection sitecall {
	  	ID ="kk" 
	  	displayName ="displayName"
          }
       }
}