XML in a Nutshell, 3rd Edition

Object Hierarchy

The following table shows the DOM object hierarchy:

Object	Permitted child objects
`Document`	`Element` (one is the maximum) `ProcessingInstruction` `Comment` `DocumentType` (one is the maximum)
`DocumentFragment`	`Element ProcessingInstruction` `Comment Text CDATASection` `EntityReference`
`DocumentType`	None (leaf node)
`EntityReference`	`Element ProcessingInstruction` `Comment Text CDATASection` `EntityReference`
`Element`	`Element Text Comment` `ProcessingInstruction CDATASection` `EntityReference`
`Attr`	`Text EntityReference`
`ProcessingInstruction`	None (leaf node)
`Comment`	None (leaf node)
`Text`	None (leaf node)
`CDATASection`	None (leaf node)
`Entity`	`Element ProcessingInstruction` `Comment Text CDATASection` `EntityReference`
`Notation`	None (leaf node)

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