text() & childNodes[0] of xPath

Hi,
  While I am going through the examples of Xpath @ w3schools site
(http://www.w3schools.com/xpath/xpath_examples.asp ) I came across
this doubt.
  <?xml version="1.0" encoding="ISO-8859-1"?>

<bookstore>

<book category="COOKING">
  <title lang="en">Everyday Italian</title>
  <author>Giada De Laurentiis</author>
  <year>2005</year>
  <price>30.00</price>
</book>

<book category="CHILDREN">
  <title lang="en">Harry Potter</title>
  <author>J K. Rowling</author>
  <year>2005</year>
  <price>29.99</price>
</book>

</bookstore>

The above xml file is the resource.

1)path=/bookstore/book/price/text()

and the part of the script is given below.

var nodes=xml.selectNodes(path);

for (i=0;i<nodes.length;i++)
  {
  document.write(nodes[i].nodeValue);
  document.write("<br />");
  }

2)path=/bookstore/book/price

and the part of the script is given below.

var nodes=xml.selectNodes(path);

for (i=0;i<nodes.length;i++)
  {
  document.write(nodes[i].childNodes[0].nodeValue);
  document.write("<br />");
  }
}

In both the above cases the output is same.So I want to know whether
the above two methods are same in functionality wise or are there any
significant different between these two methods?

Thanks
Sanjaya.