xmlnode与xmlelement区别

xmlnode与xmlelement的属性和方法大多都一样,xmlnode是xmlelement的父类,请问它们之间的区别还有什么呢???请求详细的解释,谢谢!!!

The Node object represents a node in the node-tree.

A node can be an element node, an attribute node, a text node, or any other of the node types explained in the "Node types" chapter.

xmlnode 的 NodeType 包括以下种类
1 ELEMENT_NODE  ( xmlelement )
2 ATTRIBUTE_NODE
3 TEXT_NODE
4 CDATA_SECTION_NODE
5 ENTITY_REFERENCE_NODE
6 ENTITY_NODE
7 PROCESSING_INSTRUCTION_NODE
8 COMMENT_NODE
9 DOCUMENT_NODE
10 DOCUMENT_TYPE_NODE
11 DOCUMENT_FRAGMENT_NODE
12 NOTATION_NODE