1/** What does a tree look like? ANTLR has a number of support classes 2 * such as CommonTreeNodeStream that work on these kinds of trees. You 3 * don't have to make your trees implement this interface, but if you do, 4 * you'll be able to use more support code. 5 * 6 * NOTE: When constructing trees, ANTLR can build any kind of tree; it can 7 * even use Token objects as trees if you add a child list to your tokens. 8 * 9 * This is a tree node without any payload; just navigation and factory stuff. 10 */ 11org.antlr.runtime.tree.Tree = function(){}; 12