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 XPath find()

XPath is a language for selecting XML nodes. It was originally part of the XSLT spec, but was split out because the W3C realized XPath was useful by itself.

In Resin, you can use XPath.find() to find a node from an XML DOM data structure.

XPath.find(String pattern, Node node)

The first example finds the first <b> in the tree.

test.xml 
<top>
  <a id='1'>
    <b id='2'/>
  </a>
  <b id='3'/>
  <c id='4'/>
</top>


import org.w3c.dom.*;
import com.caucho.xml.*;
import com.caucho.xpath.*;

...

Document doc = new Xml().parseDocument("test.xml");

Element elt = (Element) XPath.find("b", doc);

System.out.println("Node: " + elt.getNodeName());
System.out.println("id: " + elt.getAttribute("id"));


Node: b
id: 2

Summary

  • XPath is a language for selecting XML nodes
  • XPath.find() returns the first matching node
  • XPath searches in document order
  • The pattern b matches any element <b>
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