XML的NodeName的特殊值

分类：Other 阅读 (2,595) Add comments

12月 242012

转载请注明原文地址：http://bcoder.com/delphi/delphi-other/special-values-of-xml-nodename

今天写一个用Java读取XML文件的代码的时候，突然在for循环里发现NodeName=#text的情况，翻来覆去的看XML并没有发现有NodeName为#text的节点。GG了一下才发现原来XML的NodeName并不只是按“<”右边的节点名来定义的，在W3C的文档中还定义了一些特殊的NodeName。

下面先看一下W3C文档中对NodeName的定义

Interface	`nodeName`
`Element`	The tag name, eg. `HTML`
`Attr`	The attribute name, eg. `id`
`Text`	`#text`
`CDATASection`	`#cdata-section`
`EntityReference`	The name of the entity reference, eg. `amp`
`Entity`	The entity name, eg. `&`
`ProcessingInstruction`	The target of the processing instruction, eg.`xml-stylesheet`
`Comment`	`#comment`
`Document`	`#document`
`DocumentType`	The name of the document type, eg. `html`
`DocumentFragment`	`#document-fragment`
`Notation`	The notation name

本人今天使用的XML如下：

<?xml version="1.0" encoding="utf-8"?>
<UserList>
  <User Name="Liu" ID="1">
    <Website><![CDATA[http://svn1.bcoder.com]]></Website>
    <Intro>I come from hebei.</Intro>
  </User>
  <User Name="Zhang" ID="2">
    <Website><![CDATA[http://www.desktoptool.net]]></Website>
    <Intro>I come from Shandong.</Intro>
  </User>
</UserList>

<?xml version="1.0" encoding="utf-8"?>

<Intro>I come from hebei.</Intro>

</User>

<Intro>I come from Shandong.</Intro>

</User>

</UserList>

在两个<User..>的前面各有一个#text类型的Node，乍一看什么都没有啊？其实<UserList>和下行的<User…>之间是有一堆的空格的，于是这堆空格就被当成了#text类型。将XML改成如下样子后就没有那两个#text类型的Node了

<?xml version="1.0" encoding="utf-8"?>
<UserList><User Name="Liu" ID="1">
    <Website><![CDATA[http://svn1.bcoder.com]]></Website>
    <Intro>I come from hebei.</Intro>
  </User><User Name="Zhang" ID="2">
    <Website><![CDATA[http://www.desktoptool.net]]></Website>
    <Intro>I come from Shandong.</Intro>
  </User>
</UserList>

<?xml version="1.0" encoding="utf-8"?>

<Intro>I come from hebei.</Intro>

</User><User Name="Zhang" ID="2">

<Intro>I come from Shandong.</Intro>

</User>

</UserList>

现在也明白为什么有的地方会用如下的判断节点类型的代码了

for (int i=0; i<uNodeList.getLength()- 1; i++){
  if (uNodeList.item(i).getNodeType() == Node.DOCUMENT_TYPE_NODE){
    //...
  }
}

for (int i=0; i<uNodeList.getLength()- 1; i++){

if (uNodeList.item(i).getNodeType() == Node.DOCUMENT_TYPE_NODE){

//...

}

打赏

One Response to “XML的NodeName的特殊值”

Android中操作XML之DOM篇 | Best Coder says:

2012-12-25 at 16:31

[…] Post navigation << Previous […]

One Response to “XML的NodeName的特殊值”

Leave a Reply Cancel reply