Problem applying an XPath expression to an org.w3c.dom.Node

[Dar Var]

Here is my XML doc:

<library>
    <book isbn="1234">
        <title>Book1</title>
        <shelf>Shelf1</shelf>
    </book>
    <book isbn="5678">
        <title>Book2</title>
        <shelf>Shelf2</shelf>
    </book>
</library>

Here is my XPath code:

    
NodeList nodeList = XPathFactory.newInstance().newXPath().evaluate("/library/book", doc, XPathConstants.NODESET);
for (int i = 0; i < nodeList.getLength(); i++) {
      Node node = nodeList.item(i);

      //String isbn = XPathFactory.newInstance().newXPath().evaluate("/book/@isbn", node, XPathConstants.STRING);
      String isbn = XPathFactory.newInstance().newXPath().evaluate("/library/book/@isbn", node, XPathConstants.STRING);
      System.out.println("isbn = " + isbn);
}

The Problem this code will only print out the first isbn on each loop.

The real question is how can I apply an XPath expression to a Node??

[Paul Clapham]

You have a list of the <book> elements already. And you iterate through that list. So in my mind, the real question is: why don't you just get the "isbn" attribute of those <book> elements? I don't see the point of running another XPath expression to get the value of an attribute, even if you were using the correct XPath expression.