48     public abstract class BaseTree : ITree {
49         List<ITree> children;
60         public BaseTree(ITree node) {  in BaseTree()
68         public virtual IList<ITree> Children {
74         #region ITree Members
86         public virtual ITree Parent {
141         public virtual ITree GetChild(int i) {  in GetChild()
151         public virtual ITree GetFirstChildWithType(int type) {  in GetFirstChildWithType()
152             foreach (ITree child in children) {  in GetFirstChildWithType()
168         public virtual void AddChild(ITree t) {  in AddChild()
189                             ITree c = t.GetChild(i);  in AddChild()
215         public virtual void AddChildren(IEnumerable<ITree> kids) {  in AddChildren()
219             foreach (ITree t in kids)  in AddChildren()
223         public virtual void SetChild(int i, ITree t) {  in SetChild()
250             ITree killed = children[i];  in DeleteChild()
284             ITree newTree = (ITree)t;  in ReplaceChildren()
285             List<ITree> newChildren = null;  in ReplaceChildren()
298                 newChildren = new List<ITree>(1);  in ReplaceChildren()
308                     ITree child = newChildren[j];  in ReplaceChildren()
342         protected virtual List<ITree> CreateChildrenList() {  in CreateChildrenList()
343             return new List<ITree>();  in CreateChildrenList()
354                 ITree child = GetChild(c);  in FreshenParentAndChildIndexes()
364         public virtual void SanityCheckParentAndChildIndexes(ITree parent, int i) {  in SanityCheckParentAndChildIndexes()
384         public virtual ITree GetAncestor(int ttype) {  in GetAncestor()
385             ITree t = this;  in GetAncestor()
400         public virtual IList<ITree> GetAncestors() {  in GetAncestors()
404             List<ITree> ancestors = new List<ITree>();  in GetAncestors()
405             ITree t = this;  in GetAncestors()
426                 ITree t = children[i];  in ToStringTree()
442         public abstract ITree DupNode();  in DupNode()