如何使用XPath在XML文档中选择多组属性？

Question

I am having trouble constructing a single XPath statement to return two different sets of attributes. 我在构造单个XPath语句以返回两组不同的属性时遇到问题。

For example take the following XML document: 例如，请使用以下XML文档：

<root>
 <line name="one" alpha="a1" beta="b1"/>
 <line name="two" alpha="a2" beta="b2"/>
 <line name="three" alpha="a3" beta="b3"/>
</root>

If I use the following XPath statement: 如果我使用以下XPath语句：

//@alpha

It yields the following attribute set: 它产生以下属性集：

alpha="a1"
alpha="a2"
alpha="a3"

What statement do I use to yield the following attribute set: 我使用什么语句来产生以下属性集：

alpha="a1"
alpha="a2"
alpha="a3"
beta="b1"
beta="b2"
beta="b3"

Answer 1

By using the | 通过使用| operator in an XPath expression you can select several paths: 在XPath表达式中，您可以选择多个路径：

//@alpha | //@beta

Answer 2

//@*[name()='alpha' or name()='beta']