树中的节点是什么？

Question

根据wiki，树中的所有内容都是节点。

树木中使用的术语

Root – The top node in a tree.
Parent – The converse notion of child.
Siblings – Nodes with the same parent.
Descendant – a node reachable by repeated proceeding from parent to child.
Ancestor – a node reachable by repeated proceeding from child to parent.
Leaf – a node with no children.
Internal node – a node with at least one child.
External node – a node with no children.
Degree – number of sub trees of a node.
Edge – connection between one node to another.
Path – a sequence of nodes and edges connecting a node with a descendant.
Level – The level of a node is defined by 1 + the number of connections between the node and the root.
Height of tree –The height of a tree is the number of edges on the longest downward path between the root and a leaf.
Height of node –The height of a node is the number of edges on the longest downward path between that node and a leaf.
Depth –The depth of a node is the number of edges from the node to the tree's root node.
Forest – A forest is a set of n ≥ 0 disjoint trees.

但后来我从SAP http://www.sapdesignguild.org/community/design/print_hierarchies2.asp找到了以下图片

所以我的问题 - 在树中调用root，leaf，parents，children，siblings作为节点是正确的吗？

Answer 1

是。根是＆＃34;根节点。＆＃34;父母是父母节点。＆＃34;叶子是叶子节点。＆＃34;树由节点组成。术语root，parent，child，sibling，leaf等只是描述节点之间的关系。

例如，根节点没有父节点。叶节点没有孩子。同级节点共享同一个父节点。