2.4. Locating Information with XPath
If you want to locate a specific piece of information in an XML document, it can be a bit of a hassle to navigate the nodes of the DOM tree. The XPath language makes it simple to access tree nodes. For example, suppose you have this XML document:
<configuration> . . . <database> <username>dbuser</username> <password>secret</password> . . . </database> </configuration>
You can get the database user name by evaluating the XPath expression
That’s a lot simpler than the plain DOM approach:
1. Get the document node.
2. Enumerate its children.
3. Locate the
4. Get its first child, the
5. Get its first child, a