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