public List<ParseTree> getAll(String label) {List<ParseTree> nodes = labels.get(label);if ( nodes==null ) {return Collections.emptyList();}return nodes;}

public virtual IList<IParseTree> GetAll(string label){IList<IParseTree> nodes = labels.Get(label);if (nodes == null){return Sharpen.Collections.EmptyList<IParseTree>();}return nodes;}
